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09-01-2023 08:14

Francisco  SÃNCHEZ Francisco SÁNCHEZ

Ascomiceto anaranjado sobre suelo desnudo, 29/12/2

27-05-2024 22:10

Ethan Crenson

Hi everyone, I found these lovely stipitate ascos

26-05-2024 12:05

Alain Delannoy

Bonjour,Je n'arrive pas à mettre un nom sur cette

25-05-2024 16:40

Sylvie Le Goff

Bonjourj'aimerais confirmation ou pas pour ce peti

25-05-2024 18:29

Malcolm  Greaves Malcolm Greaves

I found a group of Mitrula gracilis? on wet debris

25-05-2024 16:54

Sylvie Le Goff

Bonjour j'aimerais confirmation ou infirmation de

22-05-2024 23:39

Marc Detollenaere Marc Detollenaere

Dear Forum,On debarked Fagus I found some small wh

21-05-2024 17:48

Karl Soler Kinnerbäck

Hi all,Could this be Venturioscypha or Venturiocis

21-05-2024 11:33

Nihad Omerovic

Hello,found on dead, dry, attached (and fallen) tw

07-11-2018 08:34

Zuzana Sochorová (Egertová) Zuzana Sochorová (Egertová)

Hello, could someone send this publication to me

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Pleosporales on Quercus branch
Hans-Otto Baral, 22-04-2009 20:41
Hans-Otto BaralA 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
  • message #7665
Hans-Otto Baral, 22-04-2009 20:42
Hans-Otto Baral
Re:Pleosporales on Quercus branch
Septa are difficult to see in the living state.
  • message #7666
Hans-Otto Baral, 22-04-2009 20:44
Hans-Otto Baral
Re:Pleosporales on Quercus branch
Asci are strongly bitunicate (central ascus is dead)
  • message #7667
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
Jacques Fournier, 22-04-2009 22:26
Jacques Fournier
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
Hans-Otto Baral, 22-04-2009 23:39
Hans-Otto Baral
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
Jacques Fournier, 23-04-2009 08:51
Jacques Fournier
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
Jacques Fournier, 23-04-2009 08:52
Jacques Fournier
Re:Pleosporales on Quercus branch
2
Jacques Fournier, 23-04-2009 08:52
Jacques Fournier
Re:Pleosporales on Quercus branch
3
Jacques Fournier, 23-04-2009 08:53
Jacques Fournier
Re:Pleosporales on Quercus branch
4
Hans-Otto Baral, 23-04-2009 13:24
Hans-Otto Baral
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
Hans-Otto Baral, 25-04-2009 17:35
Hans-Otto Baral
Re:Pleosporales on Quercus branch
I discovered only one further perithecium. here you see how sparsely it grows on the substrate.

Zotto
  • message #7687