20-12-2025 23:08
Patrice TANCHAUDBonsoir, récolte sur sol sablonneux dans l'arriÃ
21-12-2025 09:32
Josep Torres
Hello.A tiny ascomycete found embedded in wood in
20-12-2025 15:47
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18-12-2025 21:17
Pol DebaenstThe identification took me to Byssonectria deformi
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Danny Newman
indet. Rutstroemiaceae sp. on unk. fallen leavesMc
19-12-2025 10:10
Patrice TANCHAUDBonjour, récolte réalisée en milieu dunaire, a
18-12-2025 17:23
Bruno Coué
Bonjour,je serais heureux d'avoir votre avis sur c
Hello Everyone,
I would appreciate some help with a delightful minute species of probably Calycellina.Found in abundance on decaying leaves of Alnus glutinosa from a very wet location in North Argyll.Apothecia very small, ranging from 100µm to about 1 mm. brown . Sessile with a marked basal ring of dark cells. Excipular structure of thin-walled rounded cells, almost 'prismatica' Apothecium surrounded be a very variable fringe of delicate hairs, mostly very short, occasionally clearly visible as ion the photo. Asci with pore that is Iodine +ve, Spores narrowly elliptical about 8 x 3. Paraphyses slender. Hairs, paraphyses and spores mostly without inclusions. Pictures taken from fresh material in water.
Apologies fro the lack of scale bars: at the time the measurement system was not functioning.
Reagrds to all, Peter Wilberforce
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do you also have a photo of the more basal excipulum? The absence of elongate VBs in the paraphyses and hairs excludes a Calycellina. My idea on this substrate is Pyrenopeziza betulina (on Betula leaves) or the similar P. fuckelii (= Microscypha monticola) on Salix leaves.
But I might be wrong ....
Alnus is certain?
Zotto
Dear Zotto,
Many thanks for commenting on this unusual species. There is no doubt at all about the identitiy of the host leaves: Alnus glutinosa. The location is a very wet and midge-ridden area in a narrow glen alongside a stream.
I tried at the time to get sections, but found the apothecia very fragile. This was using a freezing stage. I have quite a bit of dried material, I'll try soaking a bit up and try sections again.
The hairs were generally very short and only visible under a stereo mic. The picture shows a most unusual long-haired sprecimen. In all cases the hairs seem to be 2-celled: a basal squat cell and an apical elongated finger-like cell. Always hyaline with few inclusions.
Thanks for trying to help with this interesting fungus.
In a few weeks time Ill try and collect more material.
Very kind regards,
Peter W