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21-12-2025 12:34

Nectria ??
Castillo Joseba Castillo Joseba

me mandan el material seco de Galicia (España) 

20-12-2025 23:08

Malvipezia pauli !
Patrice TANCHAUD

Bonsoir, récolte sur sol sablonneux dans l'arriÃ

21-12-2025 09:32

Spherical Pyrenomycete
Josep Torres Josep Torres

Hello.A tiny ascomycete found embedded in wood in

21-12-2025 01:54

Ophiostoma
David Chapados David Chapados

Hi,Would it be possible to find the species with t

20-12-2025 15:47

Greenish asco on pine?
Mirek Gryc

Hi.These grew on pine wood that was heavily covere

20-12-2025 10:49

Small resin asco?
Mirek Gryc

Hi. „I doubt it is possible to identify this ti

18-12-2025 21:17

Two collections of yellowish discs on bare ground
Pol Debaenst

The identification took me to Byssonectria deformi

15-12-2025 07:09

indet. Rutstroemiaceae sp. on unk. fallen leaves
Danny Newman Danny Newman

indet. Rutstroemiaceae sp. on unk. fallen leavesMc

19-12-2025 10:10

Peziza vers varia ?
Patrice TANCHAUD

Bonjour, récolte réalisée en milieu dunaire, a

18-12-2025 17:23

Polydesmia fructicola ?
Bruno Coué Bruno Coué

Bonjour,je serais heureux d'avoir votre avis sur c

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Vibrissea flavovirens?
Stefan Jakobsson, 08-07-2022 02:34
I found a Vibrissea which in most respects resemble V. flavovirens. However, the color is more greyish than "flavovirens". Also the asci and spores are somewhat small. The living asci are on average 175 µm long and the spores about 130 µm. The 16-segmented spores behave as they should, break up into four part-spores with four segments: (24.8) 26.6 - 35.8 (40.9) × (1.2) 1.4 - 1.6 (1.7) µm.

Can it be confirmed that this is V. flavovirens?

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Hans-Otto Baral, 08-07-2022 08:39
Hans-Otto Baral
Re : Vibrissea flavovirens?
I think the colour is not so important. Since I do not have an overniew on available measurements, I cannot easily say if such small measurements ever occurred, but I do not know a further species with these characters.
Stefan Jakobsson, 08-07-2022 11:49
Re : Vibrissea flavovirens?
Thank you!

I looked up the asci and spore size in a few sources.
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Hans-Otto Baral, 09-07-2022 09:42
Hans-Otto Baral
Re : Vibrissea flavovirens?
Thanks for this survey. In my key I wrote for flavovirens:

asci *260-343 x 6.5-8.8 µm

spores *125-195 x 1.2-1.8 µm

spore fragments *(27–)30-42(–51) µm

Ascus measurements in your table are probably mostly in dead state, but the differences to living asci are apparently not very high.

In the type of V. minima Velen. on Salix, which I restudied and considered a synonym, I found asci +154 x 4.8-5.3 and spore fragments 27-48 µm. So your spore fragments are a bit shorter than usual.

In a collection from Sheffield (HB 9520) I measured spores *125-134 µm long (like yours), breaking into 4 part spores of *27-38 x 1.3-1.6 µm, 4-celled (ascus length  not measured).

In the case there is a continuum of measurements among collections, I suspect that living asci much shorter than 260 µm also occur.

Identities in the literature are perhaps not certain. E.g. Zheng & Zhuang 2017 do not mention the number of spore cells and fragments, but the spore photo suggests flavovirens indeed.