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14-03-2026 13:51

Phylloscypha sp
Thierry Blondelle Thierry Blondelle

Hi everybody Under Quercus ilex, i hesitate to na

12-03-2026 19:44

Ostropoloid fungus on Hibiscus
Enrique Rubio Enrique Rubio

Hi to everybody.Can you give me any suggestions ab

11-03-2026 17:36

Help for Genus and Species ID
Michel Hairaud Michel Hairaud

Bonjour, Je cherche des indices  pour cette réc

12-03-2026 15:45

Dematioscypha cf. olivacea
Åge Oterhals

Dear forum,I found this small discomycete on a ver

05-03-2026 10:07

White apothecia on pine cone
Hulda Caroline Holte

Hello, I found and collected this species growing

08-03-2026 14:05

Helvella lacunosa
Thierry Blondelle Thierry Blondelle

Bonjour à tous,Sur 3 récoltes supposées de H. l

12-03-2026 16:17

Mollisia atlantica
Sylvie Le Goff

Bonjour à tousRécolté dans le 22 en France (ré

12-03-2026 14:37

Octospora
David Wasilewski

These small ascomycota (1-3 mm) ere observed growi

11-03-2026 16:48

Saccobolus minimoides ?
Bruno Coué Bruno Coué

Bonjour, je serais heureux d'avoir votre avis sur

09-02-2026 22:01

Sp
ruiz Jose

Hola, me paso esta colección en madera de pino, t

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Pale 4-spored pyrenomycete
Eduard Osieck, 16-07-2015 22:36
On a dead Arctium (= herbaceous) stem pale round ascomata with 4-spored asci with a long stipe. Spores are one-celled, rather small (7-9 x 5-7 um), brown with a germ pore at each end. Ascomata become dark when spores become ripe. Ascoma wall presumably a textura epidermoidea.

I have no idea what it is. It does not concern 4-spored genera like Boothiella (spore length > 10 um) and Arxiomyces (ascomata dark and beaked).


Does anybody has a suggestion what this could be?


Thanks in advance, Eduard

  • message #36989
  • message #36989
  • message #36989
  • message #36989
Eduard Osieck, 14-09-2015 22:55
Re : Pale 4-spored pyrenomycete
Further study has revealed that the collection best matches the characteristics of the genus Pseudallescheria (see Guarro 2012, Soil Ascomycetes): cleistothecium, textura epidermoidea, brown one-celled spores with a germ pore at each end. However, this genus is only known with 8-spored asci. The main question is what is the taxonomic significance of the spore number/ ascus? Does it depend on environmental conditions? 
  • message #37953
Eduard Osieck, 27-12-2021 12:10
Re : Pale 4-spored pyrenomycete
Finally this fungus has got a scientific name thanks to two German collections and the Westerdijk Institute (former CBS): Paramicrothecium sambuci.


(sheet 1329, pages 262-263).