Unknown pyrenomycet - Forum ASCOFrance

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Unknown pyrenomycet

Gernot Friebes, 27-03-2010 12:57

HI,

I found this pyrenomycet on the bark of a branch of Picea abies which was lying on the ground. Conspicuous are first of all the two-layered ascomata with a thick, carbonaceous layer covering a thin, greyish perithecium.
The ascomata were smooth, black, tiny, superficial and opening by a small pore. The spores are smooth, 17-19.5 x 3,5-4 µm, three-septate, filled with many little oil drops when living, when dead there are fewer but bigger oil drops. The asci are 44-48 x 10-12 µm, 8-spored and unitunicate with a slightly refractive apical apparatus (see the arrows). Paraphyses are present and up to 1.5 µm wide.
I would be very thankful if you could help me.

Best wishes,

Gernot

Gernot Friebes, 27-03-2010 12:58

Re:Unknown pyrenomycet

sections:

Gernot Friebes, 27-03-2010 12:58

Re:Unknown pyrenomycet

micros (scale=10 µm):

Jacques Fournier, 27-03-2010 14:56

Re:Unknown pyrenomycet

Hi Gernot,
most likely a Chaetosphaeria. Is there any hyphomycete around? Otherwise it will be difficult to identify.
Chaetosphaeria pulviscula has similar spores and its anamorph is usually absent on natural substrate, it might be a possible match but I do not clearly recognize it in vertical section. Coniferous wood is likewise unusual for this taxon. Just check other species of Chaetosphaeria with such spores.
Cheers,
Jacques

Gernot Friebes, 27-03-2010 17:03

Re:Unknown pyrenomycet

Hi Jacques,

I could not observe any hyphomycetes, unfortunately. Do you know any literature on that genus, maybe with a key? I only found the paper by Fernández et al. in the Mycologia but it doesn't actually help.
By the way, a moment ago I found Piotr's fungus which looks similar to my pyrenomycet: http://www.ascofrance.fr/index.php?r=forum&page=viewtopic&id=2176&highlight=Chaetosphaeria#msg2177
Maybe it's related to my fungus.

Best wishes and many thanks for your response!

Gernot

Jacques Fournier, 27-03-2010 18:51

Re:Unknown pyrenomycet

the most useful paper I know is that of Réblova The genus Chaetosphaeria and its anamorphs 2000
Studies in Mycology 45: 149-168.
Sorry I don't have it as pdf, maybe someone else can help.
Jacques

Gernot Friebes, 27-03-2010 19:59

Re:Unknown pyrenomycet

thank you, one can find the paper on the internet:

http://www.cbs.knaw.nl/publications/1045/content/pdf/149-168.pdf

Best wishes,

Gernot

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