The Wood for the Trees: The Long View of Nature from a Small Wood. Richard Fortey

brick-and-flint-walled vegetable garden at Greys Court. Catherine Stapleton was particularly expert on pelargoniums. Her knowledge was recognised by the honour of having a cultivar named after her in 1826: ‘Miss Stapleton’. It is still available as a variety from specialist nurseries. It has charming rich red flowers, paler at the base and decked with a single dark spot on each petal.17 I have a pot of it on my window ledge. With her botanical predilections I am certain that Catherine walked in her own woodland. There she would certainly have found the only member of her favourite geranium family that grows in Lambridge Wood (Grim’s Dyke Wood included) – the common wayside weed Geranium robertianum, ‘herb Robert’. She, like me, must have bent down to examine its small, richly red flowers, and must have smelled its curious pungency, and felt the glandular stickiness of its divided leaves, so often tinted blood-red, and noted its odd, stilt-like roots. She too would have known that this herb was named for Nicolas Robert, a pioneer of accurate botanical illustration in seventeenth-century France. I can imagine sharing with her a moment’s communion over a mutual enthusiasm before the proprieties of the time sent her scurrying back to the old house.

      Fiddleheads

      Ferns have subtle beginnings. As the bluebell leaves fade to little more than slime, ferns push out their new fronds. In the larger clearing, fresh shoots of brambles seem to unfold their leaves even as I watch. Every early shoot – Dylan Thomas’s ‘green fuse’ if ever I have seen one – is almost soft, and downy, and I have nibbled one and found it pleasant and nutty. Today, the backwardly curved spines lining the veins on the underside of the newly unfurled leaves are already beginning to harden – soon they will be capable of delivering a scratch. The bramble patch is impenetrable and intimidating, and the new growth will serve only to thicken its dense conspiracy. Amidst the scrubbiest part of it are dry, brown, fallen fronds of last year’s male ferns (Dryopteris filix-mas). From their centre new growth rises assertively. Rebirth started obscurely a month ago as a cluster of dark knobs. Each one soon rears up of its own accord into a fiddlehead, a kind of self-unwinding spiral that uncurls upwards into the spring sunlight. It is rather like that irritating party toy with which children love to blow raspberries at their friends. At the fiddlehead stage it is said to be edible, and I can see a bruised crown where deer have treated the new growth as a seasonal snack. Even now some of the fronds are opening out, like some unfathomable piece of origami, unsheathing the elegant, pinnate blade that will see the year out. The clustered male fern fronds triumph over the brambles. Once the fronds are fully dark green they will be primed with the poisons that have helped them survive since before the dinosaurs; and then their spore packages will ripen in tiny curved organs beneath each leaflet.

      Under drier beech another kind of fern is less difficult to reach, and is more delicate: a buckler fern (Dryopteris dilatata), with a triangular frond, finely divided, and broadest at the base. It seems too fragile for such a challenging place where little else grows, and even its fiddlehead is more tentative. The shaft that bears the growing frond is delicately clothed in brown, chaff-like flakes. And now on the ground all around this fern so much more brown chaff: little purplish-tan clumps of defunct stamens no bigger than a fingernail have dropped down from the canopy. This is all that remains of the inconspicuous beech flowers. They have already done their job far above me, though the beech leaves are still so new. The greatest trees have the least spectacular flowers.

      It may seem unlikely that beech leaves could contribute to a delicious alcoholic drink, but I have made a liqueur from them for several years, and most of my guests are surprised it is so easy on the tongue. Beech-leaf noyeau can be made in early May when the leaves are freshly unfurled. They are still pale green and soft to the touch – they can be rolled up like cigarette papers. Any tougher and they are bitter. I try to exclude as many of the little brown bracts that originally enclosed the leaf as I can. It takes an unexpectedly long time to pick enough fresh leaves to lightly fill a plastic bag. Once back in the kitchen I stuff a preserving jar quite tightly with the leaves, until it is rather more than half full. Then they are covered with gin (or vodka) until the jar is about three-quarters full. I do not use a high-class brand suffused with many exotic botanicals, but the cheaper stuff from that supermarket shelf marked ‘Youths and Alcoholics Only’. I leave the sealed jar for a month to steep. Then the leaves are removed, allowing all the liquor to drain off. If there are any funny bits floating about, now is the time to remove them. For a whole bottle of gin (700 ml) the next ingredients are 200 grams of sugar, around 200 ml of brandy, and 250 ml of water. After boiling the water to dissolve the sugar the resulting syrup is allowed to cool completely. I then add the syrup and the brandy to the beech-leaf elixir and put the mixture back in the preserving jar, preferably with half a vanilla pod. By Christmastide it should be a lovely golden colour. Only a very cynical person would say that it tastes of brandy and vanilla.

      Bats!

      Claire Andrews has installed her bat monitors. She strapped the recording devices on to our trees about ten feet off the ground, one on the oak by the clearing, the other on a big beech in a sheltered part of the Dingley Dell. They are painted in camouflage colours, and are inconspicuous once in place. They are like discreet garters hitched up on the legs of the trees. Over the next week or so they will record the ultrasonic echolocation noises used by bats to detect their prey, along with their calls one to another.

      When I was young I could hear the ‘squeaks’ of bats, but now I am sadly deaf to such crepuscular cries; yet I have seen dancing, shadowy shapes of bats hunting over our clearing outlined momentarily against a darkening sky, black against indigo. How appropriate is the German word for bat – Fledermaus, ‘flitter mouse’ – which exactly captures these stuttering dashes across the heavens.

      It is impossible exactly to identify a species of bat in flight. Our recording machines are attuned to pick up the high-frequency cries of these most elusive mammals. Different species ‘squeak’ at different frequencies and with different cadences, as they locate and home in on their prey, especially moths. They use echoes to build up a map of their surroundings, rather as the sonar system installed in ocean-going vessels is used to visualise the sea floor. Bats are exquisitely attuned to avoid obstacles in their way, so negotiating a contorted flightpath under our trees poses no problem. Some of their prey species (among them noctuid moths, which are common in the wood) have evolved organs adapted to ‘hearing’ their approaching nemesis, and will take evasive action if they detect pursuit, such as dropping rapidly downwards from their flight trajectory. Evolution often works as a kind of arms race, with ever more sophisticated methods of attack provoking ever more subtle lines of defence. We need not wonder at the extraordinary auditory organs of the long-eared bats, bizarre though they might appear. These bats ‘whisper’ with low amplitude and short duration to fool their prey, and they need exceptional hearing from massive ears to detect the tiniest sounds made by insects that they may pick up directly from leaves. By day, all bats hang themselves up like folded umbrellas in secluded roosts. Claire has already spotted several holes in beech trees, and, elsewhere, loose pieces of bark that would afford suitable hideaways. There is nothing to do now except leave the contraptions to do their work.

      More than a week later, we feed the digital chips from the recording devices into Claire’s computer. Time is ticked off along a chart that reels out on screen the batty history of the glades as night falls. Here is a series of calls from the main clearing at 8.26 p.m. precisely, registering at 45 kilohertz, following sunset seventeen minutes earlier: they appear on the chart as a succession of reverse ‘J’ shapes, rather like the strokes of an italic pen. ‘The one you’d expect,’ says Claire. ‘Common pipistrelle (Pipistrellus pipistrellus).’ At 8.39 another batch of short calls appears showing a rather similar shape, but at a different pitch of 55 kilohertz. ‘That’s the soprano pipistrelle (Pipistrellus pygmaeus). It “sings” at a higher frequency.’ Claire tells me that the soprano was only named as a species separate from the common pipistrelle in 1999, which seems extraordinary. How could a British mammal elude recognition for so long? We have known all the others for two centuries. Evidently, the two species are extremely similar small brown bats, although they are now known to have different breeding and feeding strategies. As with a lie detector, their voices gave