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31-05-2025 00:51

Ethan Crenson

Hello, Last week in New York City this Orbilia wa

30-05-2025 10:20

Elisabeth Stöckli

Bonjour, Sur branches mortes de Salix en place (m

30-05-2025 14:40

Josep Torres Josep Torres

Hello.An ascomycete from last May 10th, sprouting

30-05-2025 17:54

Louis DENY

Hello forum!Touvé près de Belfort, altitude 350m

30-05-2025 17:55

Louis DENY

Hello forum!Touvé près de Belfort, altitude 350m

20-05-2025 22:15

Francois Guay Francois Guay

I found this ascomycete at the base of a dead fern

30-05-2025 12:53

Gernot Friebes

Hi,I'm struggling to find a name for this species.

17-05-2025 18:52

Francois Guay Francois Guay

I found this interesting asco in Quebec,Canada las

28-05-2025 21:19

Terje Kristiansen

The rose is intertwined with black elderberry.Prob

26-05-2025 19:11

Edmond POINTE Edmond POINTE

Bonjour, apothécie poilue, jaune pale 495µm poil

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small blackish xerotolerant discomycete on branch of Quercus
Andreas Gminder, 04-05-2025 11:37
Andreas GminderHello,
yesterday I took an attached branch of Quercus for further inspection at home to hopefully find some xerotolerant Ascos (Orbilia ....)
What I found - besides Orbilia trapeziformis - was a very small brownish-blackish ascomycetes which I don't know. I have the impression to have found it earlier already, but don't remember ....

Macroscopically reminding at Claussenomyces xylophilus or a small Durella species, very gregarious to crowded, < 1 mm in diam and only visible after rehydration.
The Textura looked like in Durella, dark brown, in KOH blackish-grey.
Unfortunately the hymenium was in all examined apothecia more or less detoratied and I could not verify the paraphyses for sure. They seemed to be cylindrical. Asci with croziers and IKI-negative.
Spores long-elliptical, appr. 8-12 x 2,5-3,2, with some small oildrops, reminding Mollisia spores
No reaction of any part of the ascocarp on KOH or Barals solution.

On still attached branch of Quercus.

Any idea?

thank you very much,
Andreas
  • message #82491
  • message #82491
  • message #82491
  • message #82491
Hans-Otto Baral, 04-05-2025 18:03
Hans-Otto Baral
Re : small blackish xerotolerant discomycete on branch of Quercus
This looks like an overmature Durella. Without asci and paraphyses I would not say something. Are the spores mature or overmature?
Andreas Gminder, 04-05-2025 18:38
Andreas Gminder
Re : small blackish xerotolerant discomycete on branch of Quercus
Hello Zotto,

I think the spores are mature, and I saw some asci with spores inside looking quite the same. The hymenium is nevertheless already quite collapsed, but I think the asci have croziers and are IKI negative.
But the spores are only one-celled and 8-12 x 2,5-3,2 µm - are there any Durella with such small spores?! In your folder there are two collections HB 5336 and HB 6363 with very similar spores ....

thank you and all the best,
Andreas
Hans-Otto Baral, 04-05-2025 20:35
Hans-Otto Baral
Re : small blackish xerotolerant discomycete on branch of Quercus
Durella suecica and commutata have small non-septate spores.

Did you see living asci? Otherwise it says nothing about spore maturity.

I think the excipulum and exudate are different to the two in my folder: olive-brown vs. red-brown, with different structure (porrecta vs. prismatica or oblita).  I wonder if some of these with red-brown exdutae are ionomidotic.

An olive-brown porrecta is typical of Durella s.str.