The weather has been absolutely hateful for a couple of weeks, and it was good to get out in daylight for a change.
A Beech tree shed this huge branch a couple of years ago, probably due to a fungal attack by Ganoderma applanatum, which is all over the tree. Various fungi are now busy decomposing the dead branch and I took a few shots.
This is Stereum hirsutum which can be resupinate (flat and crusty) or can form continuous waves of brackets:
Some clusters were in tiered groups:
Neobulgaria pura is gelatinous throughout and is specific to dead Beech:
Last year I showed the Oak leaf-miner Ectoedemia herengi, which makes mines in 'green islands' in fallen leaves.
The mine has only just started to form and we're into November:
The tree would normally withdraw all chlorophyll from the leaves before shedding them, but leaves with Ectoedemia larvae retain some of the chlorophyll and the miners continue to use the food source, thereby extending their active breeding season. The mechanism whereby the larvae blocked the chlorophyll has been largely unknown, but recent research has revealed a stunningly complex answer to the mystery.
Plants are largely controlled by hormones and some insects have managed to use this feature to their own advantage. (Gall-making insects use a similar technique to force non-standard growth of leaves, buds and roots.) The hormonal signature of the Ectoedemia larvae was noted to be similar to that of some bacteria, and the bacteria were found to be present in the larvae. When the larvae were dosed with an antibacterial, the leaves failed to make mines, so the bacteria are essential for the green islands to form. It looks like the larvae have formed a symbiotic relationship with the bacteria in order to perform their season-extending trick. The closer you look, the more complex our wildlife appears.
This is a good time of year to look at mosses and lichens: the season's growth has died back to reveal our smaller species and many of them are now fruiting or making spores.
This Cladonia lichen has bright red fruitbodies. Looks to be Cladonia macilenta.
Lycogala terrestre is a slime mould which forms purplish spherical bodies which later split to reveal a bright pink spore-bearing interior:
Just as I was leaving the woodland I spotted a group of Lesser Dungflies spread around various leaves on Bramble:
5 comments:
"It looks like the larvae have formed a symbiotic relationship with the bacteria in order to perform their season-extending trick." - absolutely fascinating - does this mean the egg is laid while the leaf is still attached to the tree? It's hard to see how the hormone could still work once the leaf has fallen and is therefore presumably quite dead.
"Lycogala terrestre is a slime mould which forms purplish spherical bodies which later split to reveal a bright pink spore-bearing interior" - they remind me of miniature marshmallows! I haven;t seen any here this year.
What were the dungflies doing "spread around"?
"does this mean the egg is laid while the leaf is still attached to the tree?"
Certainly. Very few fallen leaves are green to any extent. The miner shown has been working for around a week, I'd say (you can just make out the initial track along the midrib).
"What were the dungflies doing "spread around"?"
Not very much. No interaction was observed. Maybe sunning?
Excellent information and photographs Stuart - I almnost want to print them all off and put them into a booklet as they are so informative.
I agree with Weaver...this information is amazing. thankyou for sharing all this...I walked in Cairn Wood Co. Down last week and the fungi was wonderful. But I had no idea what it all was. Still good though.
Weaver: Feel free to print any images for your personal use. I'm afraid they won't be very large, though: web images are made small for speed. 12 x 9 cm. if my calculations are correct. Please be aware that identifications based solely on photographs are likely to be innaccurate: I spend a lot of time with microscopes and identification keys. The differences between some species are truly microscopic.
Gerry: there is a fungal interest group based in Queens College, Belfast: the Northern Ireland Fungus Group. Their website is http://www.nifg.org.uk.
They're very friendly and you can join their forays which you will find listed on the website.
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