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27-03-2024 22:53

Charles Aron Charles Aron

Hi All,Recently I came across these minute, setose

26-03-2024 17:14

Juuso Äikäs

These little black ascos were growing on a dead, d

25-03-2024 13:41

B Shelbourne B Shelbourne

• Hyaloscyphaceae (no VBs), Hyaloscypha: Macro a

25-03-2024 21:27

Riet van Oosten Riet van Oosten

Hello, Found by Laurens van der Linde, March 2024

26-03-2024 14:37

DAVID MARCOS DAVID MARCOS

Spores (telles qu'elles apparaissent à l'intérie

24-03-2024 08:27

Thierry Blondelle Thierry Blondelle

HiOn Hedera helix fallen branchEcological habitat:

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michel bertrand

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B Shelbourne B Shelbourne

• Scuttelinia: Macro and habitat.• S. scutella

25-03-2024 20:21

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Bonjour, je m'appelle David et je débute dans l'i

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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
  • message #10895
Gernot Friebes, 27-03-2010 12:58
Re:Unknown pyrenomycet
sections:

  • message #10896
Gernot Friebes, 27-03-2010 12:58
Re:Unknown pyrenomycet
micros (scale=10 µm):
  • message #10897
Jacques Fournier, 27-03-2010 14:56
Jacques Fournier
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
Jacques Fournier
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