06 Tuesday Apr 2021
Tags
British trees, bud burst, Field maple, Field maple bud burst, Field maple leaf burst, leaf burst
Field maple leaves are now bursting out wherever I walk, and they speak truth to the old saying that ‘good things come in small packages’. The tiny buds are exquisitely fashioned, covered in a soft furry outer skin that splits open to reveal the sculptural beauty of the prominent lime-green veins and much-folded pinkish-red blade.
28 Sunday Mar 2021
Have you been watching the greening? The buds on the trees growing ever fatter? Swelling to the point where they burst with spring goodness?
This year I’ve been paying more attention to this incredible process. These are some images of Hawthorn from the last couple of weeks.
12 Tuesday Jan 2021
These two fungi, found on Ash keys, were last week’s record of the week at my local biodiversity records centre, SEWBReC – not my record, that of another local recorder – but seeing this on Twitter last Friday reminded me to check the next Ash trees I saw. That opportunity came on Sunday’s walk and I found the fungi on just the second tree I passed by.
The two fungi are Diaporthe samaricola (the small black dots on the seed part of the key, on the left below) and Neosetophoma samarorum (the much smaller, black speckles on the wing part of the key, on the right in my photo). Both fungi are under-recorded in my area, so I’ll now be checking all the Ash keys I find.
10 Sunday Jan 2021
Tags
I’m not sure I can subscribe to the ancient concept that wearing a wreath of ivy leaves around my head would stop me getting drunk but the leaves are certainly amazing and incredibly diverse in shape, form and colour. Juvenile leaves have between 3 and 5 lobes, while mature leaves have no lobes and can be shaped both like ovals and hearts.
And then there are the flowers, in bloom from September through to November and a source of food for more than 50 insect species, and the subsequent berries, ripe from November to January – or, until the berry-loving winter thrushes, finches, woodpigeons and other hungry birds gobble them all up. What an incredible plant ivy is!
14 Monday Dec 2020
It’s #LeafmineMonday again on social media so here’s another leaf mine to look for when you’re out walking. And this is an easy plant to recognise because I’m sure everyone knows what the Butterfly bush (Buddleja davidii) looks like, right?
These mines on Buddleja leaves, which start as a narrow corridor and quickly develop into a large blotch, are caused by the larvae of a tiny fly, Amauromyza verbasci. The fly also lays its eggs on several other plants, including Mullein and Common figwort.
Mines can be seen from June to November, so it’s almost too late to see these now. The Buddleja plants in my area are already generating new growth but, as you can see from the photo above, the mines may still be seen on the older leaves before they drop.
According to the UK Fly mines website, Amauromyza verbasci is widespread in Britain, though I have to say that I have only seen these mines once, despite a lot of looking at Buddleja bushes. And this sighting was a particularly lucky one for me, as this turned out to be the 1000th species (of flora and fauna) I had recorded on my local biodiversity records centre database.
10 Thursday Dec 2020
At first I thought this incredibly tiny creature was the early instar of a shield bug but, when I couldn’t find any pictures that resembled it on the British Bugs website, I turned to Twitter for help. Luckily, a botanist I know, Karen, had seen something similar posted recently in a Facebook group and very quickly supplied me with a name, Crypturaphis grassii, the Italian Alder aphid, so named because it’s only ever found on Italian Alder trees (Alnus cordata).
I found online a report published in 2011, on the first records of this species in Cornwall, which provides some interesting detail about these aphids. Apparently, Crypturaphis grassii is ‘native to southern Italy and Corsica and [was] first recorded in the UK in 1998’. Intrigued, I returned to the tree I’d found my first specimen on and found many more of these creatures, with variations in colour and markings. The report explains that:
Viviparous individuals [those able to birth live young] are yellowish-green to yellowish-brown, with brown spots extending along the dorsal surface, around the edge of the abdomen and on the head. Compound eyes are reddish in colour. … Immature apterae [wingless individuals] are similar but smaller, paler and lacking in dark spots, more translucent and slightly more elongate in shape. Oviparous apterae [wingless individuals that are able to lay eggs] are similar in size and shape to viviparous apterae but are brown in colour, with transverse darker abdominal stripes, rather than spots.
The Italian Alder, on which the aphid feeds, was ‘commonly planted as a roadside, waterside and/or windbreak species’ during the 1980s, and, by 2011 when the report was published, the aphids had already spread widely throughout Britain, including having established colonies in the Vale of Glamorgan, which is where I found the aphids in my photographs.
Citation: Luker, Sally. (2011). CRYPTURAPHIS GRASSII (STERNORRYNCHA: APHIDIDAE): FIRST RECORDS FOR CORNWALL. British Journal of Entomology and Natural History. 24. 205.
07 Monday Dec 2020
Tags
Cerodontha iridis, Iris foetidissima, Iris leaf miner, leaf mines, leaf-mining fly larvae, leafminer, Stinking iris
When I first recorded this leaf mine (found on 24 November at Cosmeston Lakes Country Park, where there is rather a lot of it in one particular area), it was named ‘Record of the Week’ by SEWBReC, the local biodiversity records centre, and hailed as only the third Welsh record (though the national recorder for this species later corrected this, as it seems several records from north Wales had not been added to the Welsh database at that stage). Since then, I’ve found these mines in five more locations, proving that once again this is an under-recorded leaf-mining species.
These leaf mines were made on Stinking iris (Iris foetidissima) by the fly Cerodontha iridis, and they can also be found in Britain on other Iris species, though I haven’t seen any of those. The mines occur in early autumn, though they can still be seen on Iris leaves later than that – I’m seeing them now, in early winter. Often the adult fly lays several eggs on one leaf and, after the larvae hatch and start munching, they create blotch mines, which may be quite large when several mines coalesce.
You can read more detailed information about this species and see some excellent images, including close-ups of the larvae and their puparia, on the Bladmineerders website here.
03 Thursday Dec 2020
Posted in insects, leaves, plants, wildflowers
Tags
Acidia cognata, British flies, leaf mines, leaf-mining fly larvae, leaf-mining larvae, leafminer, Petasites fragrans, Winter heliotrope
Though the UK Fly mines website says the leaf mines of the little orange fly Acidia cognata are made in October-November, I’m sure the mines will still be visible this month, and possibly further into the winter, so this is one to look out for now when you’re out walking.
One of the plants this fly mines – this is the one I’ve found these mines on – is Winter heliotrope (Petasites fragrans), which is particularly noticeable now, due to the pretty pink flowers that appear from November to February. Other favoured larval plants are Butterbur (Petasites hybridus), a plant very similar to Winter heliotrope, and Colt’s-foot (Tussilago farfara), the leaves of which don’t appear till after the flowers, so approximately from April onwards.
After hatching, the Acidia cognata larvae create a corridor on the upper surface of the leaf. As the larvae grow, the mine widens and eventually becomes more of a blotch, especially if there are several larvae on a single leaf and their mines meet. I’ve found these mines in two local patches of Winter heliotrope but not found any sign of them in other locations, so distribution does seem a little random. If you spot any, please do record your sightings as, like many leaf-miners where the adult flies are not often seen, this species is probably under-recorded.
30 Monday Nov 2020
In his ‘Ode to a Nightingale’, Keats wrote of a ‘light-winged Dryad of the trees’ singing of summer in ‘some melodious plot of beechen green’. The beechen green has now become beechen gold and brown, but I can still imagine Dryads singing of the beauty of mighty Beech trees, in all their autumnal finery, and even performing paeans in praise of their statuesque forms once those golden leaves have fallen.
21 Saturday Nov 2020
Tags
beech, leaf mines on Beech, moth larvae in leaf mines, moth leafmines, Parornix fagivora, Phyllonorycter maestingella, Phyllonorycter messaniella, Stigmella hemargyrella, Stigmella tityrella
Five species of Lepidoptera larvae can be found in the leaves of Beech (Fagus species) and, with a lot of searching, much head-scratching, some rejections, and the much appreciated assistance of our county moth recorder Dave, I’ve now found and positively identified all five in my local area.
Stigmella tityrella: This moth’s larval leaf mines featured in last week’s post about green islands. The gallery (like a corridor) mine is usually compact and angular and, in particular, the larva stays between the veins when creating its mine – that is the feature I find helps most with its identification. As you can see from the two mines below, the galleries are very narrow to begin with, then broaden as the larvae grow.
Stigmella hemargyrella: These larvae also create a gallery mine, but the mine is most often wider and longer than that of S. tityrella, and the larvae have no issue with crossing over the leaf veins.
Parornix fagivora: This is the mine I’ve found least in my local area, though I’m not sure if that’s a reflection on the moth’s rarity or my finding skills. Look for a blister, where the larva lives at first, and then a folded leaf edge, which it inhabits a bit like a cave.
Phyllonorycter messaniella: Both Phyllonorycter species on Beech create blisters; this one is usually an oval shape, almost rectangular, and quite broad. I’ve found the upper side of the leaf can be almost featureless but the blister on the underside is quite obvious so, if recording these, it’s best to include a photo of both sides of the leaf.
Phyllonorycter maestingella: This blister mine is long and quite narrow, and often placed between leaf veins. By spinning silk, the larva draws the leaf together to create a cosy tunnel, which looks a bit like a crease on the upper side of the leaf.
I’ve attached to each of the moths’ names a link to the species description on the British Leafminers website, which is an excellent resource for anyone wanting to learn more.
