The Garden Snail, Helix aspersa, has a thin, lightweight shell but that still looks cumbersome as it explores a fern-filled crevice in an old wall (see previous posts). As I drew it from a photograph that I’d taken this morning I noticed traces of damage to the shell with what appears to be a healed break in the rim and hairline fracture on the ‘back’ of its shell.
I imagine it being surprised, perhaps by a bird, retracting into its shell then falling from the wall onto the pavement below.
A second snail clung precariously to the base of the stems of Common Ragwort, growing from a crevice near the top of the six foot high wall amongst the fronds of Rusty-back Fern and Wall Rue.
Wall Rue, Asplenium ruta-muraria grows alongside the Rusty-back Fern in the crevices of an old wall in Ossett. It is a common fern of walls and limestone crevices.
Leathery leaves and long wiry roots are useful adaptations for conserving water.
Like the Rusty-back it is a member of the Spleenwort family, used as a herbal remedy for diseases of the spleen and also in the treatment of rickets.
The Rusty-back fern, Ceterach officinarum, has rusty scales on the backs of its leaves. These cover the spore-producing sori and probably help prevent the fern from drying out. During dry spells the fronds roll in at the edges.
Growing to just few inches, this fern is found in dry crevices in limestone and in old mortared walls. A small colony grows on a north-east facing sandstone wall on Station Road, Ossett.
It is best grown in a cold frame, potted rather high, among loam mixed with a large proportion of brick-rubbish, and not over-watered.
Thomas More, British Ferns, 1861
Rusty-back or Scale fern, drawn by W.W. Coleman, British Ferns, 1861.
Rusty-back fern is a member of the spleenwort family and was used to treat diseases of the spleen. Legend has it that Cretan sheep with spleen disorders would greedily devour its rootstock.
It’s scientific name Ceterach is said to derive from the Arabic ‘Cheterak’ the name that Eastern physicians used for this plant.
Featherlike antennae help the male track down the larger female.
When disturbed the Yellow-tail Moth,Euproctis similis, sticks the end of its abdomen up between its wings. Both male and female have the yellow tip although it is larger in the female.
Some female moths spread pheromones by raising their tails and the males use their feathery antennae to home in on them.
So why does this male raise his ‘tail’ when disturbed? Is it a way to surprise a predator?
The male has dark spots on his wings.
It’s the first time that this species has turned up in the moth trap.
The male seen from below.
Yellow-tail moth caterpillars have been found on Japanese Knotweed, an invasive garden escape which very few native insects feed on, but they’re more likely to feed on sallow, blackthorn and hawthorn.
THERE WERE at least half a dozen Large Yellow Underwings in the moth trap this morning plus some of their smaller relatives but this is the first time that I’ve seen the Broad-bordered Yellow Underwing, Notcua fimbriata. This is a male; the female is paler.
It’s more typical of wooded areas than gardens but as the foodplants of its larvae include docks, nettles, brambles, sallows and willows it’s not surprising that it has turned up here.
Although it’s years since I last saw a Silver Y moth, Autographa gamma, I didn’t have any difficulty in putting a name to it, thanks to the conspicuous calligraphic Y on its wing. This is the first time that it has turned up in the moth trap and that could be because, as an immigrant each year to Britain, it has taken until now to reach Yorkshire.
Dun-bar
There are so many brownish, streaked little moths, both micro and macro, that I find drawing them gives me my best chance of picking out the pattern as I look through the field guide. Taking a close look at this, I noticed that the two bands and the inconspicuous dot made a pattern like a carnival mask, enabling me to identify it as the Dun-bar, Cosmia trapezina, a common moth from lowland Scotland southwards, wherever there are trees.
Fan-foot
While I sketched these moths Barbara went through the book and came up with a name for this obscure-looking delta-winged little moth. It’s the Fan-foot, Zanclognatha tarsipennalis, a common moth of woods, hedges and gardens.
The the three lines on its wing are;
curved/wavy
like a question mark
almost straight
with a row of fine dashes along the edge of the wing.
Orange Swift
Lets have an easier moth; the male of the Orange Swift, Hepialus sylvina, has a bright orange-brown forewing. It’s larvae feed on herbceous plants including dock, dandelion and bracken.
Underwings
These two underwings are so regular in the moth trap that I tend to ignore them so that I thought it was about time that I made a quick sketch of them.
Drawn from my own photograph, which can be easier than peering into a bug box.
AT FIRST GLANCE you might think ‘butterfly’ as the Early Thorn, Selenia dentaria, is the only Thorn moth to hold its wings up in butterfly fashion.
You might be thinking that late July doesn’t qualify as ‘Early’ but this is a female of the second generation, which usually has a larger tawny orange patch on its underwing than the February to May generation.
As the name suggests, she might well be looking for a blackthorn or hawthorn to lay her eggs on, there are plenty in the immediate vicinity, but the larvae will also feed on birch, alder, honeysuckle, sallow or bog-myrtle. They’re common in a wide variety of habitats including gardens, hedges and woods so they should feel at home here.
THIS IS the moth trap that I’ve been using. It’s built from a design that you can find in the Anglian Lepidopterist Supplies Beginners Guide to Moth Trapping, which is available as a PDF from the Anglian Lepidopterist Supplies website. It slots together so it’s easy to dismantle for storage.
I bought the black light UV bulb in September, intending to have the trap ready for the moths of early autumn but by Christmas I still hadn’t made a start on it so I’m grateful to my friend David Stubbs of Solway Dory who made this for me in his workshop.
He made one modification to the design which isn’t essential but which I’ve found helpful; the original design is apparently open to the ground so he added a plywood base that rests on batons of 1×1 inch timber glued around the bottom edges of the trap. This is useful on a summer morning when I need to move the trap into the shade to deal with later.
A further improvement that I have in mind: I’m checking in charity shops to see if I can find a suitable heatproof glass container, such as a large cafetière, to cover the bulb so that if there’s a shower during the night it will be protected.
I didn’t want to run the cable out of a window so I had an outdoor electrical socket with a circuit breaker fitted on the back wall of the house, which is a useful thing to have anyway.
Mercury Vapour or UV?
A couple of friends who’ve had experience of moth-trapping recommended that I start with a UV lamp rather than the more powerful mercury vapour. Apart from potentially annoying the neighbours in a back garden location like mine, the mercury vapour brings in so many moths from such a wide area that it can be daunting for the beginner to deal with quantity and variety of species caught.
My friend Tim Freed who does moth surveys sometimes runs three traps simultaneously but he stops up all night going from one to the other logging the catch.
I’m happier to be dealing with much smaller samples of the local moth population but I hope that I’ll be able to keep this up through the seasons and gradually get an impression of the bigger picture.
I’ve got a number of moth books but I think the essentials are Field Guide to the Moths of Great Britain and Ireland by Paul Waring and Martin Townsend and Field Guide to the Micro Moths of Great Britain and Ireland by Phil Sterling and Mark Parsons. Both are illustrated by Richard Lewington.
Moths are so variable that its helpful to check out other books and to Google the species and conjure up dozens of images of it.
This smooth newt is a male; note the banner-like tail.
WE CAUGHT smooth newts, freshwater leeches and pond snails in one of the ponds at Hassacarr nature reserve, Dunnington Common, near York on this morning’s Wakefield Naturalists Society field meeting. This is only the second occasion on which I’ve tried out the possibilities of underwater movies using my Olympus μ Tough so using the iMovie app I’ve put together a few clips in this YouTube video.
Sketching the newt as it swam around the tank gives some impression of its movements but you can’t improve on the video clip in the way it shows the looping movement of the leech.
Tubular Water Dropwort
Seed-heads of tubular water-dropwort.
Tubular Water-dropwort, Oenanthefistulosa, grows around the edges of the largest pond. It one of the rarer species to be found on the reserve, declining as its wetland habitats disappear.
Around York, a city long famous for its flooding, wetlands is sometimes seen as prime real estate. Earlier this year one developer was frustrated that his plan to build an out of town department store was held up for several months because the resident population of great crested newts had to be relocated.
We found no great crested today at Dunnington but they are often found on pond-dipping days on the reserve.
AMONGST THE usual suspects – peppered, ‘clay’, footman, heart and dart – rounded up in the moth trap this morning there’s a new and, as a change from all those little brown jobs, a suitably distinctive looking moth. I sketch it several times to take in the appearance of it.
Those swirls at the ends of its forewings remind me of knots in wood. It’s the pebble prominent, Notodonta ziczac, the ‘pebble’ being the light brown area rather than the swirl. It’s a common and widespread moth of mature woodland, hedges and gardens; habitats that Coxley Valley has a plentiful supply of.
The Garden Snail, Helix aspersa, has a thin, lightweight shell but that still looks cumbersome as it explores a fern-filled crevice in an old wall (see previous posts). As I drew it from a photograph that I’d taken this morning I noticed traces of damage to the shell with what appears to be a healed break in the rim and hairline fracture on the ‘back’ of its shell.
