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12-03-2026 19:44

Ostropoloid fungus on Hibiscus
Enrique Rubio Enrique Rubio

Hi to everybody.Can you give me any suggestions ab

11-03-2026 17:36

Help for Genus and Species ID
Michel Hairaud Michel Hairaud

Bonjour, Je cherche des indices  pour cette réc

12-03-2026 15:45

Dematioscypha cf. olivacea
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Dear forum,I found this small discomycete on a ver

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Hello, I found and collected this species growing

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Helvella lacunosa
Thierry Blondelle Thierry Blondelle

Bonjour à tous,Sur 3 récoltes supposées de H. l

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Mollisia atlantica
Sylvie Le Goff

Bonjour à tousRécolté dans le 22 en France (ré

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Octospora
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Saccobolus minimoides ?
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Bonjour, je serais heureux d'avoir votre avis sur

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Sp
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Hola, me paso esta colección en madera de pino, t

11-03-2026 14:14

Scopinella on Dryas octopetala
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Hi,I would like to share a collection of Scopinell

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Small hairy discs on Castanea
Marc Detollenaere, 31-01-2026 09:17
Marc DetollenaereDear Forum,

On decorticated wood of Castanea,I found some small hairy grey discs.
Asci measured 42x6µ, the spores were hyaline 6x2µ and contained a small guttule at both sides. Hairs were also hyaline, smooth,cylindric, septate and measured 55-60µ. 
Any ideas?

Marc
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Kosonen Timo, 31-01-2026 11:30
Kosonen Timo
Re : Small hairy discs on Castanea
looks like O. transiens. Check for dextrinoid hair apex.

Timo
Marc Detollenaere, 31-01-2026 17:04
Marc Detollenaere
Re : Small hairy discs on Castanea
Hi Timo,

Using IKI no dextrinoid reaction of the hairs was seen. Asci had an amyloid pore.

Marc
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Kosonen Timo, 31-01-2026 17:23
Kosonen Timo
Re : Small hairy discs on Castanea
ok. Well, with that ecology & spore size & multiseptate hairs ...Sorry, I dont have good suggestions. Another "Hyaloscyphaceae"... Possible genera are Mimicoscypha, Olla (still), Resinoscypha and Psilocistella or something in between. But the small(ish) spores lead me to think of transiens. Looks like there are no dextrinoid reactions anywhere else either (excipulum), sometimes amyloid "nodules" somewhere. Also worth checking: does anything stain strongly blue with cotton blue.

cheers
Timo
Marc Detollenaere, 01-02-2026 09:31
Marc Detollenaere
Re : Small hairy discs on Castanea
Could Psilocistella quercina be a match?
Kosonen Timo, 01-02-2026 11:05
Kosonen Timo
Re : Small hairy discs on Castanea
A very good suggestion!
t