Two Coombes of Lansallos circular walk
  1. Turn left out of the car park and follow the lane to a track beside the church with a no-through road sign.

    The church is on the site of an earlier Norman church and before that, Celtic missionary monks had an establishment here that the "Lan" in the name refers to. The present church building was dedicated to St Ildierna on 16th October 1321, was rebuilt in the 15th century, and contains a number of important architectural and historical features.

    In 2005, the church and many of its ancient artefacts were badly damaged in a fire which is thought was an act of arson. The now partly incinerated mediaeval chest gives an idea of the intensity of the blaze which also damaged both the roof and organ. Fortunately, the magnificent carved oak benches, made between 1490 and 1520, survived the fire.

  2. Turn right onto the track beside the church and follow it to a waymark just before the gate of the Old Rectory. Bear left down the path waymarked with pink arrows and follow this to reach a gate where it emerges from the trees at the bottom of the valley.

    The name celandine is thought to be derived from the Greek word for swallow, based on the arrival of swallows being a sign of spring. Another common name for celandine is spring messenger, based on the early flowering. This was presumably also the basis of the Victorian use as a symbol of "joys to come".

    The footpath along the stream, known as Reed Water, is an ancient route from the village to the cove. It was cut out to form a cart track to serve both the cove and the mill, and ruts from the cartwheels are still visible. In March and April, celandines flower along the wooded path.

  3. Go through the gate and continue ahead at the junction of paths to the gate ahead. Go through this to reach a fork in the path. At the fork, the walk continues to the left but Lansallos Cove is to the right if you want to explore that first. Follow the Coast Path, ignoring paths to the left and right to reach a gate across the path.

    Lansallos Cove is also known as West Coombe, after the valley. The sheltered beach is composed of sand and shingle and was used to launch small fishing boats. The same characteristics that made it a good launching spot also make it good for swimming, particularly at mid-high tide when the bottom is sandy (at low tide, rocks are exposed). The bowl shape of the cove also traps warm water as the tide rises over the rocks and sand exposed to the sun. Sand from the cove was used by local farmers to improve soil drainage and as a source of lime. Seaweed was sometimes also used as a fertiliser as it is rich in potassium and contains a number of trace elements needed by plants. The small waterfall on the side of the beach was once used to power a mill.

  4. Go through the gate and follow the path to a fork. Keep left at the fork in the path (the right-hand path leads to Parson's Cove). Continue on the coast path until, just before a footbridge, a path departs inland to the left, signposted on a piece of stone to Lansallos.

    Along the coast, from June onwards but particularly in the late summer and autumn, parasol mushrooms are common. They are one of the easier mushrooms to recognise due to their huge size (and umbrella shape when fully open). The brown flecks on their otherwise white flesh are caused by the rapidly expanding young mushroom bursting through a brown outer coating as it grows (a bit like "sugar puffs" breakfast cereal!). Other characteristic features include a snakeskin-like brown pattern on the stem and there's often a ring around the stem which is detached (can be carefully slid upwards to verify).

    Parasol mushrooms have firm white flesh and delicate flavour which is not strongly "mushroomy". This makes them an excellent carrier for other flavours within a sauce, adding texture and body to a dish.

    At Parson's Cove there is little or no beach at high tide but as the tide goes out, a beach of sand and shingle is revealed with some patches of rock. The cove faces southwest and therefore gets the afternoon sun, and is quite sheltered, making it a good spot to access the water for snorkelling.

  5. Bear left on the path to Lansallos, through the gate. Follow the path parallel along the fence on the right to reach another gate in a hedge across the meadow.

    The Birdsfoot Trefoil has yellow flowers tinged with red that look like little slippers and appear in small clusters. They are followed by seed pods that look distinctly like bird's feet or claws. Common names referring to the flowers include "Butter and Eggs", "Eggs and Bacon" and "Hen and Chickens", and to the seed pods, the delightful "Granny's Toenails".

    It is a member of the pea family and is poisonous to humans (containing glycosides of cyanide) but not to grazing animals and can be grown as a fodder plant. It is the larval food plant of many butterflies and moths including the common blue and silver-studded blue, and an important nectar plant for many bumblebee species.

    A large buoy in the bay, with an eerie bell which can be heard ringing when there is a swell, marks the position of Udder Rock. A white obelisk on the coast path between Lansallos and Polperro also provides a daymark that boats can use to avoid it. Udder Rock is a pinnacle reef which breaks the surface at low tide but is fully submerged at high tide, making it particularly hazardous to shipping. The reef consists of a number of ledges and these support an array of marine life, making it a fairly popular dive site.

  6. Go through the gate and follow the path parallel to the stream to reach a gateway in the hedge at the top of the meadow.

    The dandelion-like flowers along the coast are most likely to be catsear, also known as false dandelion. Catsear is very salt tolerant, not only growing along the coast but actually in sand dunes. The easiest way to recognise it is by the hairy leaves, hence the name. If you can cope with the texture, the leaves are edible and are much less bitter than dandelion leaves.

    Another way to tell them apart is when they are flowering. Although dandelion flowers over quite a long period, the most profuse flowering is in April and May whereas catsear's intense flowering period is in late June and through July. Catsear has neater flowers than dandelion with squarer edges to the petals (but still toothed). The stems supporting the flowers are also solid, in contrast with the hollow stem of the dandelion.

    Clover is a native plant and a member of the legume (pea and bean) family. It is also sown as a fodder crop and as "green manure" as it improves soil fertility. The two most common species are known simply as white clover and red clover, based on the colour of their flowers, with the latter generally being a slightly larger plant. Red clover leaves also have a white V shape.

  7. Go through the gateway and follow the path alongside the stream and along the fence to reach a gate at the top of a short flight of steps.

    If there are sheep in the field and you have a dog, make sure it's securely on its lead (sheep are prone to panic and injuring themselves even if a dog is just being inquisitive). If the sheep start bleating, this means they are scared and they are liable to panic.

    If there are pregnant sheep in the field, be particularly sensitive as a scare can cause a miscarriage. If there are sheep in the field with lambs, avoid approaching them closely, making loud noises or walking between a lamb and its mother, as you may provoke the mother to defend her young.

    Sheep may look cute but if provoked they can cause serious injury (hence the verb "to ram"). Generally, the best plan is to walk quietly along the hedges and they will move away or ignore you.

  8. Go through the gate and follow the path to a gate onto a lane.

    East Coombe is an example of a hanging valley, with the stream falling down a cliff to meet the sea.

    Hanging valleys are common on the North Cornish coast and are created due to erosion of the relatively hard cliffs by the Atlantic waves being faster than erosion of the valley by a small river. In many cases, this results in a waterfall where the small river meets the sea cliff, though many of these are little more than a trickle in dry weather. When there is a strong onshore gale, the waterfalls sometimes run backwards!

  9. Go through the gate and turn left onto the lane. Follow the lane back to the church.

    The vetches are a family of wildflowers that is a sub-group within the pea and bean family. Their pretty purple flowers are quite like mini sweetpea flowers. The leaves are also very distinctive, organised in a neat row either side of the stem. Common vetch is a wildflower but is also sown by farmers in some grazing fields to improve the nutrition for ruminants and to introduce more nitrogen into the soil.

    In the 1780s, Britain was in financial crisis after losing the American War of Independence. High levels of duty were imposed on luxury goods in order to recoup the national debt and this included the curing salt vital to the pilchard industry which was taxed at around 4000%! Consequently many Cornish fishermen that were previously legally employed by the trade were driven into illegal smuggling. Towards the end of the 18th Century, nearly half a million gallons of brandy and more than a quarter of a million pounds of tea were being smuggled into Cornwall each year. This continued until the 1840s, when Britain adopted a free-trade policy that slashed import duties. Within ten years, large-scale smuggling was just a memory.

  10. Continue on the lane from the church to return to the car park.

    The inscription on a gravestone in Lansallos churchyard records the untimely death of John Perry at the age of 24 in 1779 "unfortunately killed by a cannon ball by a person unknown," probably as a result of an encounter with a Revenue vessel at sea.

    In Prime of Life most suddenly.
    Sad tidings to relate.
    Here view my utter destiny
    and pity my sad fate.
    I by a Shot which rapid flew.
    Was Instantly Struck dead.
    Lord pardon the offender who.
    My precious blood did shed.
    Grant Him to rest and forgive me.
    For all I've done amiss.
    And that I may rewarded be.
    With everlasting bliss.

Palace Cove may sound grand but it is from a local dialect word for pilchard cellars (which were known as Pilchard Palaces). The term is thought to have its origins in the Cornish word for "place". Little remains of the old cellar at Palace Cove; it is now just a flat grassy area with some remnants of walls. The cove is rocky at high tide and has a good selection of rockpools, but care must be taken not to get cut off by the tide. As the tide falls, a sandy beach is revealed.

In Dec 1911 the SS White Rose set sail from France to Liverpool and disappeared. A report from The Telegraph said the ship was last seen "flying signals of distress and has not been reported since". Over the next few days, three boats from the ship washed up along the Cornish coast but with no-one onboard. Eventually the ship was found to have hit Udder Rock and then drifted and sunk with the loss of all hands. The ship's anchor and chain are still on the seawards side of the rock. It appears that the holed ship may have been driven inshore before finally sinking: broken-up remains lie in shallow water near Nealand Point.

In Cornwall, cliffs erode at an average rate of between roughly 3cm - 30cm per year depending on the hardness of the rocks and location. In reality this often happens in infrequent sudden collapses rather than as a steady, gradual process. It was found that one massive storm in 2014 caused around 100 times the average amount of erosion. There are obvious implications from climate change leading to more frequent or more intense storms.

If you're walking on a bright summer morning, you may see little orange 5-point star-shaped flowers of the scarlet pimpernel.

On a sunny day, the flowers open in the morning and then close about 2 PM. The plant is also known as poor man’s weatherglass because if it’s dull or wet, the flowers close earlier or may never open at all that day.

Another strange quirk of this plant is that in Spain, the flowers are bright blue, not orange!

A plant often seen along the coast with small pink 5-petalled flowers in June -September is centaury - a member of the gentian family. The name is from Greek mythology: according to Pliny, the centaur Chiron used this plant to heal an arrow wound in his foot (or maybe that should be "hoof").

Wild thyme grows along the coast and flowers from June to September with tiny pink flowers. During mediaeval times, the plant was a symbol of bravery, possibly due to derivation from the Greek word thumos, meaning anger or spiritedness. An embroidered motif of a bee on a sprig of thyme is said to have been given by mediaeval ladies to their favoured knight.

Coastal land management including removal of excess gorse and grazing to keep taller plants in trim has allowed wild thyme to become more widespread as well as the Cornish chough. Wild thyme is a nectar source for many bees and butterflies and the food plant for young caterpillars of the large blue butterfly.

The ferns with solid leaves are appropriately called hart's tongue as the leaf resembles the tongue of a deer. It is the only native species of fern that doesn't have divided leaves. The Latin name for the species means "centipede" as the underside of the leaves have rows of brown spore cases that form a pattern resembling centipede legs.

Hart's tongue ferns thrive in shady places and are tolerant of the lime used in mortar so are sometimes found growing in old walls. It's an evergreen so leaves can be seen all year round but there's usually a flurry of new growth in mid March when new leaves can be seen gradually unfurling over a number of days.

Like its domesticated relatives, wild garlic grows from a bulb. To distinguish it from other wild plants from the onion/garlic family (such as the three-cornered leek), the species sometimes just called "wild garlic" (Allium ursinum) is often known by the name ramsons or broad-leaf garlic. The scientific name (meaning bear leek) is because the bulbs are thought to be a favourite food of brown bears on the European mainland.

Unlike their more versatile narrow-leaved cousins the three-cornered leeks, ramsons grow mainly in shady places such as woodland. Their broad leaves are solar panels that have evolved to capture the weak winter light early in the year before the trees are in leaf. They are an indicator that woodland is ancient and has provided a shady environment over a long period to colonise.

Despite the pungent smell, the leaves of wild garlic are quite delicate in flavour so can be used quite large quantities in cooking or more sparingly within salads. They are at their most fiery early in the season. As well as a garlic flavour, the leaves have a slight (though not excessive) bitter note which can be balanced against sweet flavours (e.g. tomato or roasted pepper) or salty flavours like bacon to cut through a rich sauce.

Wild garlic is best harvested in early spring before it flowers and the leaves start to die off. Unlike domestic garlic, the leaves are generally used rather than the bulb, which is very small. Note that there are some lilies that look very similar and are poisonous! If it doesn't smell strongly of garlic/onions, then it's not wild garlic and should be avoided. A schoolboy error is to rub the leaves between fingers where the smell lingers so a subsequent poisonous lily leaf could be misidentified.

Wild garlic can be preserved as a frozen paste for use as a cooking ingredient throughout the year. Simply whizz up roughly chopped leaves in a food processor with enough olive oil to make a fairly thick paste and then freeze this in an ice cube tray (or slightly larger silicone moulds if you have them). Standard cooking olive oil will do for this (it's a waste to use extra-virgin as the powerful garlic will mask its flavour). Turn out the frozen blocks into a bag and keep in the freezer. They can then be used as garlic "stock cubes", added just before the end of cooking.

Wild garlic has been found in settlements dating as far back as the neolithic period which given its springtime abundance and aroma is not that surprising. Its culinary use was eventually overtaken by domesticated garlic which first arrived with Mediterranean traders and had the advantage that the bulbs could be stored for relatively long periods.

If cows eat wild garlic, this flavours their milk. Whilst this is definitely not what's wanted for tea or cornflakes, the butter made from it is more useful. This means of producing garlic butter became popular in Switzerland in the 19th Century.

All plants in the onion family are poisonous to dogs including wild garlic. This is one of the reasons that feeding dogs human foods (many of which contain onion such as gravy powder) is not good for them. Garlic is extremely toxic to dogs and cats and the consumption of even a small amount can lead to severe poisoning. Keep dogs away from wild garlic and wash their paws if they come into contact with it.

You can make impressively green pasta with wild garlic and the garlic flavour goes well with most pasta sauces. Whizz up some wild garlic leaves with olive oil to make a thick paste (or retrieve some of this from the freezer and zap in the microwave to defrost). Whisk an egg and add roughly the same amount of your wild garlic paste as the egg. Now keep adding plain flour until you reach a stiff dough (stiffer than bread dough). Roll out fairly (but not excessively) thin keeping it coated with plenty of flour to stop it sticking. Roll it up into a Swiss roll and then cut at 1cm intervals with a sharp knife. Unroll all the strips into a floured surface first and then quickly drop them into boiling water. It will be done in just a minute or 2 (as soon as it floats) so get the strips in at the same time and have your pasta sauce made and ready to go before you cook the pasta.

In a small food processor, whizz approx 20g of Italian-style hard cheese (Parmesan or Pecorino). Optionally whizz in about the same amount of any toasted nuts (nice but not vital). Next whizz in 50g of wild garlic leaves. You can also add 10g lemon balm leaves if you have it growing in your garden. Add zest of a lemon, juice of half the lemon and whizz in a couple of glugs of olive oil to the desired consistency. Finally whizz in salt and pepper to taste.

Make your own super-quick fresh pasta with 200g plain flour, 4g salt, 1 egg and enough water to form a smooth dough. Use a good dusting of flour and roll out thin. Dust again, roll up into a Swiss roll and cut across at 1cm intervals to form spirals. Unravel each and drop the squiggles into boiling water. Done when it floats (about 2 min).

Scholars speculate that the Celtic Cross (a crucifix with a circular ring) developed from the sun cross (a cross inside a circle), a common symbol in artefacts of Prehistoric Europe, particularly during the Neolithic to Bronze Age periods. When Christianity came to the Celtic regions, Christians extended the bottom spoke of this familiar symbol, to remind them of the cross on which their new Saviour was crucified.

Ferns evolved a long time before flowering plants and dominated the planet during the Carboniferous period. The bark from tree ferns during this period is thought to have been the main source of the planet's coal reserves.

Fern fronds form in a coil (known as a crozier or fiddlehead) with the delicate tip protected in the centre. As the outer parts begin to photosynthesise, the sugars they produce cause more water to be drawn into the leaf, causing it to expand and gradually unfurl.

Ferns produce 2 different types of leaf (although they often look quite similar). The normal leaves are used for photosynthesis of sugars just like in other plants. Ferns also produce a special kind of spore-bearing leaf which can often be identified from the dots on the underside. In hart's tongue ferns, these are really obvious.

Ferns produce neither flowers nor seeds and rely on the tiny spores for their reproduction which are most commonly distributed by the wind. This allows them to colonise some quite random places such as rocky ledges that heavier seeds might not reach. Since the spores come from just one parent fern, the offspring is a genetic clone.

The spore from a fern doesn't grow into a fern. Instead it grows into an organism resembling a liverwort (i.e. a small green blob). Instead of producing spores, these produce eggs and also sperm which they interchange with neighbouring blobs to get a new mix of genes. The fertilised egg grows into a new fern and so this alternating process of ferns and blobs repeats.

Mosses are close relatives of the first plants to colonise the land 500 million years ago. They descended originally from freshwater algae but evolved an outer coating that protected them from the temperature changes and UV radiation that made life on the land more of a challenge than in the water. There are now estimated to be over 10,000 species of moss.

Mosses reproduce with tiny spores rather than seeds. Many mosses use wind to carry their spores and produce tiny stalks with the spore-releasing equipment on the top in order to catch the wind - these can be seen as thread-like structures standing up from the moss. These spore-releasing devices often have a ring of teeth around the edge (visible with a magnifying glass) to control the release of the spores, allowing them to be released gradually over a period of time to catch gusts of wind of different speeds and in different directions.

Sphagnum (peat) mosses use compressed air to launch their spores. To get an idea of the acceleration that the spores are launched with, an astronaut in a rocket launch experiences an acceleration g-force of about 3 g and the maximum in a fighter jet is about 9 g. Sphagnum moss spores are accelerated at 36,000 g!

Mosses don't have roots but instead have little rootlets known as rhizoids. Since there is no need to root into soil, mosses can grow on stones, tree trunks, buildings etc. This together with their wind-carried spores makes them excellent colonisers of barren land. The buildup of organic material from dead moss then provides an environment that other small plants can start to colonise.

Mosses' lack of deep roots mean they need to store their own supply of water during dry periods which is why they are found in shady places that are not dried-out by the sun. This also applies to moss on trees - it rarely grows on the south-facing part of the trunk which can be used as a crude form of compass when navigating.

Some mosses are able to absorb 20-30 times their own weight in liquid. Moss was used in several ancient cultures as nappies: babies were carried in a moss-lined bag to prevent leaks. Moss has also traditionally been used to line hanging baskets which are very prone to drying-out. Areas of moss help to protect soil from erosion by runoff and rivers from sediment and flooding by capturing rainfall and giving it chance to soak slowly into the soil.

Swallows have evolved a long slender body and pointed wings that makes their flight more than twice as efficient as other birds of a similar size. In flight, swallows can reach 35 mph which is particularly impressive given they weigh only 20 grams.

Swallows forage for insects on the wing, typically around 7-8 metres above the ground, but will skim over the surface of the ground if that's where the insects are. They can sometimes be seen skimming the surface of water either to drink or to bathe which they also do in flight.

The streamers on swallows tails serve an aerodynamic function, assisting tight turns to catch insects. Experiments with sand martins found that they could be "pimped-up" by adding artificial streamers to their tails which afforded them increased manoeuvrability in a flight maze. The suggestion for why swallows have evolved streamers and not sand martins is partly the speedier insects that swallows need to catch and also that sand martins live in burrows and this would risk breaking off one streamer, leading to unbalanced flight.

The length of swallows streamers has been found to be about 20% longer than the aerodynamic optimum, particularly in males which have longer tails than females. This is thought to be runaway sexual selection where a "size matters" preference of females selects for males with the longest streamers. During the period when streamers first evolved, length correlated with fitness of males. Now it has passed the optimum it has become a sexually-selected handicap like a peacock tail.

Swallows migrate to India, Arabia and Africa for the winter. Swallows cover about 200 miles in a day when they are migrating. Journeys of over 7000 miles have been recorded.

Swallows face a major weather forecasting challenge: to know when to migrate, they need to know what the temperature will be like 7,000 miles away. It is thought that swallows solve this problem by choosing locations at each end where the respective dipping and rising temperatures correlate well, so the temperature when leaving is what they can expect when they arrive.

Based on the long distances covered by swallows, a swallow tattoo was popular with sailors to show off their sailing experience. One tradition is that a sailor would gain one swallow tattoo for each 5,000 nautical miles sailed, so a sailor with two swallows had travelled over 10,000 nautical miles.

During Mediaeval times, migration wasn't understood so the vanishing of swallows in winter was a bit of a mystery. The accepted theory to explain this was therefore that swallows spent the winter buried beneath the mud of ponds and lakes!

Swallows are often found near herds of livestock where the flies that swallows catch are more numerous. It is thought that swallows were much rarer before humans started keeping animals. Consequently, the rise of veganism is not good news for swallows - a decline in dairy farming and increase in arable will inevitably result in their decline.

Swallows are known by the name "barn swallow" due to their preference for nesting in man-made structures open to the elements such as stables or under bridges. Before these were available, swallows used to nest in caves and on cliff faces but they now nest almost exclusively on man-made structures. In the case of barns, these are conveniently located near insects associated with livestock. They may also be using presence of humans to help keep predators away.

In areas where ospreys are common, swallows will nest below an osprey nest and form a cooperative relationship where the swallows warn the osprey of nest raiders and the ospreys drive away other birds of prey that eat swallows. The osprey became extinct in England and Wales during Victorian times due to egg collecting but through a combination of reintroduction from Scotland and natural recolonisation from Scandinavia, ospreys are gradually returning. They are regular visitors to West Cornwall and are most likely to be seen on big lakes or estuaries in April or September.

Water mint is a wild species of mint which grows in damp places or even in water. It can be recognised by leaves and the strong mint smell when these are crushed. It produces a ball of lilac flowers in late summer.

Water mint will hybridise with spearmint and this creates peppermint (which itself is sterile).

Water mint and peppermint have high levels of menthol whereas the sweeter flavour of spearmint comes from a different chemical called corvone. Menthol creates a cold feeling on the skin by activating the sensory receptors in a similar way that chilli creates a heat sensation.

The metal signs on stone walls with a maze with a map of Cornwall are from the Cornish Hedge Community Heritage Project - usually known by its more snappy Cornish name - Kerdroya. 11 sections of Cornish hedge have been restored and the project culminated in building the world's largest labyrinth at Colliford Lake incorporating a number of different styles of Cornish hedge.

Over 160,000 species of butterfly and moth have been described and nearly 19,000 of these have been found in the UK. Butterflies are effectively a sub-group of moths that fly during the day. They have adaptations for this such as wings that fold flat against each other with a camouflaged underside to help them hide from predators when landed but a patterned upper surface to attract mates during flight. Whilst moths' feathery antennae are highly optimised for an incredibly sensitive sense of smell, butterflies can make use of vision so their antennae are more streamlined and are also used to measure air temperature.

The oldest moth fossils found so far are from the Carboniferous period 300 million years ago. By the Middle Triassic (age of amphibians - before the dinosaurs), moths had evolved their proboscis used to collect nectar from flowers. Day-flying butterflies were on the scene in the Late Cretaceous (when Tyrannosaurs were around). Originally it was thought day-flying was to avoid night-flying bats but it's now thought more likely that this was mainly to take advantage of the abundance of nectar that was originally targeted at bees.

A popular misconception is that a butterfly was originally called "flutterby". In fact, the name stems from the Old English word buttorfleoge which literally means "butterfly". The term "flutterby" is thought to have been coined by Shakespeare.

Exactly why butterflies were associated with butter is a bit of a mystery. One theory is that they were seen hovering over pails of milk and thought to be stealing or protecting the butter. Another is that the yellow brimstone was the species for which this name was first devised.

When a caterpillar is still developing, it grows a small group of cells - known as an imaginal disc - for each of the adult body parts it will need as a mature butterfly. When a caterpillar pupates, it digests itself, releasing enzymes which dissolve all of its tissues into a soup leaving only the imaginal discs. These then act as seeds from which the adult butterfly is resurrected.

Many butterflies taste/smell using chemoreceptors on their feet and antennae. They can detect a sugar solution (nectar) with their feet that they can feed on. Female butterflies also detect suitable caterpillar food plants on which to lay their eggs.

Oystercatchers are recognisable by their black-and-white bodies, their long, straight red beaks and loud, piercing call. In flight, the white markings form an image of a white bird towards the back of their otherwise black backs which may have evolved to confuse predators.

The long beaks are adapted to open shellfish - mainly cockles and mussels - "cocklecatchers" would be a more accurate name. They can also use their bill to probe for worms.

Lichens are a partnership of two different organisms: a fungus providing the "accommodation" and an alga or cyanobacterium providing the "food" through photosynthesis. The fungal partner provides a cosy, sheltered environment for the alga and tends it with mineral nutrients. However, the alga partner is more than simply an imprisoned food-slave: it is such a closely-evolved alliance that the fungus is dependant on the alga for its structure. If the fungal partner is isolated and grown on an agar plate, it forms a shapeless, infertile blob.

One in five of all known fungi form lichens. Studies suggest that many species of fungi that form lichens started out from ancestors that lived on organic waste. Fossils have also revealed that the symbiosis between algae and fungi dates back more than 400 million years roughly to the time when plants first evolved from green algae.

Lichens often grow on sick or dying trees so some gardeners assume that the lichen might be harming the tree. In fact, it's purely because these trees have fewer leaves so there is more light available for the algae inside the fungus to photosynthesise. It's too dark under many healthy trees for the lichen to grow.

You'll notice that there is lichen growing on many of the headstones in the churchyard. Of the 2,000 British species, over a third have been found in churchyards and more than 600 have been found growing on churchyard stone in lowland England. Almost half the species are rare and some seldom, if ever, occur in other habitats. Many churchyards are found to have well over 100 species.

Lichens obtain nearly all their nutrients from the atmosphere and therefore can be very sensitive to air pollution. As a general rule of thumb, healthy lichens means clean air, but more specifically, different species have been found to be sensitive to different pollutants. By identifying common species that exhibits change for a particular pollutant, lichens can be used as an early warning dashboard showing not only how much air pollution there is but also what kind.

The Greater Black-backed Gull is the largest member of the gull family and a bird of formidable size, with a wingspan of nearly 6ft. Unlike other gulls, the Greater Black-backed Gull is highly predatory. Young birds are a significant portion of its diet and it tends to live amongst other seabirds where it can eat the neighbours. It has also been known to swallow whole rabbits and even eat young lambs. It often steals food from other seabirds using its large size to intimidate them into dropping it, and consequently it is sometimes referred to as a pirate.