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05-05-2025 09:35

Nicolas Suberbielle Nicolas Suberbielle

Bonjour à tous,Marie-Rose d'Angelo de la SociétÃ

05-05-2025 10:09

Nicolas Suberbielle Nicolas Suberbielle

Re-bonjour,Cet ascomycète trouvé et étudié par

29-04-2025 09:13

Louis DENY

Bonjour forumVosges du sud, ballon d'Alsace altitu

01-05-2025 20:11

Zuzana Sochorová (Egertová) Zuzana Sochorová (Egertová)

Hello, today I have collected a tiny ascomycete g

04-05-2025 11:37

Andreas Gminder Andreas Gminder

Hello,yesterday I took an attached branch of Querc

02-05-2025 08:41

Tony Moverley

A Monilinia type fungus has recently been collecte

02-05-2025 08:45

Isabelle Charissou

Bonjour, existe-t-il un pdf d'un Glossarium polygl

03-05-2025 12:43

Matthias Reul Matthias Reul

Hi together, Maybe someone has an idea about this

02-05-2025 13:29

Isabelle Charissou

Bonjour, j'aimerais savoir s'il y a eu des public

03-05-2025 18:35

Edmond POINTE Edmond POINTE

J'ai  connu Michel DELPONT au début de ma passio

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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.