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03-02-2026 20:44

Zetti Mario

When I first saw this white mould on an Agaricus s

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Lothar Krieglsteiner Lothar Krieglsteiner

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Andgelo Mombert Andgelo Mombert

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Andgelo Mombert Andgelo Mombert

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31-01-2026 10:22

Michel Hairaud Michel Hairaud

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Bernard CLESSE Bernard CLESSE

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01-02-2026 19:29

Nicolas Suberbielle Nicolas Suberbielle

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éric ROMERO éric ROMERO

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31-01-2026 09:17

Marc Detollenaere Marc Detollenaere

Dear Forum,On decorticated wood of Castanea,I foun

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Unknown Asco
Chris Johnson, 04-01-2016 11:27
Good morning

Found on rotten wood of unknown species. Just 0.4mm across on what appeared to be a very short pedicel. Pale yellow with a hint of green (not as green as the image would suggest). Only one apothecium found which is immature.
Asci weakly amyloid in Lugol's, no obvious bluing at the apices: 97-108 x 10-12 µm
Most asci too imature to show spores clearly. The image shown would appear to have muriform spores.
Paraphyses longer than the asci, multi-septate and constricted at the septa.
Not expecting much from this but it might remind members of a genus.

Regards, Chris
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Quijada Luis, 04-01-2016 19:26
Re : Unknown Asco
Dear Chris,

I believe your sample is a Claussenomyces species or at least related, the blue reaction of the wall it is not clear to me, maybe an artifact, and as far as I know only Claussenomyces pseudosugae have blue reaction in the asci wall, but it is clear and strong. There are too many similar species in the genus, I have worked several types species, but I have some more to review and right now I cannot give you a identification with the data that you show. It is important you see the ascoconidia, secondary ascospores that form conidia balls inside the asci when they are living. If you collect again other sample try to photograph a general section of excipulum, more ascospores and the ascoconidia, then maybe we can try to fit at species level.

best wishes,

Luis 

Chris Johnson, 04-01-2016 20:54
Re : Unknown Asco
Dear Luis
Many thanks for looking at this for me. Claussenomyces looks very convincing and I'm more than happy to have a genus at this stage. With just one immature apothecium, it was never going to be conclusive.
The fragment of wood I have hasn't produced any more apothecia but I will revisit the area later this month.
I have noted you comments on what to look for.
Best regards,
Chris