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Pleosporales on Quercus branch
Hans-Otto Baral,
22-04-2009 20:41
A few small scattered black perithecia with dark brown stiff setae, but no Capronia. Found near Nürnberg on still attached dead Quercus branch 15 mm thick, corticated, on bast (where Vuilleminia grew), soc. Cryptodiscus foveolaris, Orbilia obtusispora, Propolis versicolor, Parmelia sulcata. Perithecia 250-300 µm diam. Sp. *55-63(-73) x 6.8-8 µm, (10-)12-14-celled. All parts IKI-.Any idea?
Zotto
Hans-Otto Baral,
22-04-2009 20:42
Re:Pleosporales on Quercus branch
Septa are difficult to see in the living state.
Hans-Otto Baral,
22-04-2009 20:44
Re:Pleosporales on Quercus branch
Asci are strongly bitunicate (central ascus is dead)
NC NC,
22-04-2009 21:09
Re:Pleosporales on Quercus branch
If the ascomata are soft-textured, this may be a species of Acanthostigma.
Amy
Amy
Jacques Fournier,
22-04-2009 22:26
Re:Pleosporales on Quercus branch
Hi Zotto,
I agree with Amy it should be an Acanthostigma, and ascospores match well those of A. minutum (Fuckel) Sacc. I repeatedly collected this fungus growing gregarious on rotten water-soaked wood, which is different from your collection, but details on its ecology are still to gather.
Jacques
I agree with Amy it should be an Acanthostigma, and ascospores match well those of A. minutum (Fuckel) Sacc. I repeatedly collected this fungus growing gregarious on rotten water-soaked wood, which is different from your collection, but details on its ecology are still to gather.
Jacques
Hans-Otto Baral,
22-04-2009 23:39
Re:Pleosporales on Quercus branch
Dear Amy and Jacques
many thanks for your identification. Yes, the peridium is quite soft. The branch was in ca. 1-2 m above ground at a S-exposed edge of a forest, and all ascos on it are strongly xerotolerant. I rehydrated the branch 4 days after I collected it during dry weather, so also the Acanthostigma is well xerotolerant.
Is there any description in Reblova & Barr 2000? Jacques, do you have a documentation of the species?
Zotto
many thanks for your identification. Yes, the peridium is quite soft. The branch was in ca. 1-2 m above ground at a S-exposed edge of a forest, and all ascos on it are strongly xerotolerant. I rehydrated the branch 4 days after I collected it during dry weather, so also the Acanthostigma is well xerotolerant.
Is there any description in Reblova & Barr 2000? Jacques, do you have a documentation of the species?
Zotto
Jacques Fournier,
23-04-2009 08:51
Re:Pleosporales on Quercus branch
Hi Zotto,
so it makes a taxon adapted to a wide range of environmental conditions.
I attach the photos of the key and the description of A. minutum by Réblova 2000.
Cheers,
Jacques
so it makes a taxon adapted to a wide range of environmental conditions.
I attach the photos of the key and the description of A. minutum by Réblova 2000.
Cheers,
Jacques
Jacques Fournier,
23-04-2009 08:52
Re:Pleosporales on Quercus branch
2
Jacques Fournier,
23-04-2009 08:52
Re:Pleosporales on Quercus branch
3
Jacques Fournier,
23-04-2009 08:53
Re:Pleosporales on Quercus branch
4
Hans-Otto Baral,
23-04-2009 13:24
Re:Pleosporales on Quercus branch
Hi Jacques
thanks, the description actually fits very well in most points. Septal number in the description is exactly as mine, also spore size and shape is wonderful. No details on the water relations of the substrate are given, regrettably. Interesting the Helicomyces anamorph, I will look again, hoping to find some perithecia left.
Zotto
thanks, the description actually fits very well in most points. Septal number in the description is exactly as mine, also spore size and shape is wonderful. No details on the water relations of the substrate are given, regrettably. Interesting the Helicomyces anamorph, I will look again, hoping to find some perithecia left.
Zotto
Hans-Otto Baral,
25-04-2009 17:35
Re:Pleosporales on Quercus branch
I discovered only one further perithecium. here you see how sparsely it grows on the substrate.
Zotto
Zotto
