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09-01-2026 17:41

Bryonectria callicarpa Döbbeler; ein Bryoparasit auf Frullania dilatata
Arnold Büschlen

Hallo, F. dilatata wird von vielen Bryoparasiten

10-01-2026 20:00

Lichenicolous fungus on Protoparmeliopsis muralis
Tom Schrier

Hi all,We found picnidia on Protoparmeliopsis mur

07-01-2026 22:22

Tatraea sp. on indet. hardwood - 303452087
Danny Newman Danny Newman

Tatraea sp. on indet. hardwood The Swag, Great Sm

10-01-2026 01:18

cf. Neovaginatispora fuckelii on indet. shrub - 305938906
Danny Newman Danny Newman

cf. Neovaginatispora fuckelii on indet. shrub Pre

07-01-2026 10:24

Pezicula sp. on indet. hardwood - 303870019
Danny Newman Danny Newman

Pezicula sp. on indet. hardwood Appalachian Highl

09-01-2026 10:08

Orbilia posible aurantiorubra
Blasco Rafael Blasco Rafael

Hola, en el mismo habitat que la anteriorRetamaDia

08-01-2026 21:22

Orbilia pilifera posible
Blasco Rafael Blasco Rafael

Hola, He recogido esta muestra de Orbilia sobre Re

07-01-2026 17:29

White tree-like anamorph on Populus
Marc Detollenaere Marc Detollenaere

Dear Forum,On a barkless Populus I found some smal

10-11-2021 17:33

anamorph Chlorociboria aeruginella
Riet van Oosten Riet van Oosten

Add-on topic http://www.ascofrance.com/forum/7059

07-01-2026 10:05

cf. Chaetospermum on Xylaria - 303631739
Danny Newman Danny Newman

cf. Chaetospermum on XylariaCosby Campground, Grea

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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.