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06-08-2025 08:56

Scutellinia cf. subhirtella
Antonio Ezquerro Antoñana Antonio Ezquerro Antoñana

Hola a todos, Me gustaría saber qué opinan sobre

12-02-2012 11:31

Spooner 1987 Australasia
Hans-Otto Baral Hans-Otto Baral

Hi allI am quite sure that nobody has a pdf of thi

02-08-2025 12:35

Hymenoscyphus albidus ?
éric ROMERO éric ROMERO

Bonjour tous, J'ai trouvé sur pétiole de Fraxin

02-08-2025 17:21

Pleomassaria protrusa description
Andgelo Mombert Andgelo Mombert

Bonjour,Je recherche la description et la planche

30-07-2025 20:52

apo on Pteridium aquilinum
Bohan Jia

Hi together,  I've been looking posts in AscoFra

30-07-2025 10:12

Asco1 sur crotte de mouton
Bernard CLESSE Bernard CLESSE

Bonjour à toutes et tous,Pourriez-vous m'aider à

31-07-2025 16:32

Carbophilous discomycete - Anthracobia pseudorehmii?
Andreas Gminder Andreas Gminder

Dear collegues,today I found on a very fresh fire

30-07-2025 18:06

Orbilia dryadum?
Stefan Jakobsson

On a decorticated twig of Alnus incana on moist so

29-07-2025 18:59

Ayuda con esta
Castillo Joseba Castillo Joseba

Me mandan el  material seco de Galicia, España,

28-07-2025 12:34

Capronia
Enrique Rubio Enrique Rubio

Hi to everybody.I would appreciate any ideas about

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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.