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19-05-2026 19:47

Xylariaceae?
Andreas Millinger Andreas Millinger

Hello dear community,found this species the second

19-05-2026 12:55

Mollisia sps? with minute spores 2.7 -3.5µm.
Hardware Tony Hardware Tony

After checking Gminder and Otto's library I cannot

19-05-2026 10:27

Peziza phlebospora ?
Patrice TANCHAUD

Bonjour, récolte récente sur terre retournée i

18-05-2026 12:43

Hymenoscyphus fraxineus
Sylvie Le Goff

Bonjour à tousPuis je avoir votre aide sur ce que

19-05-2026 14:56

Unknown cushion-formed with clavate margin hairs
Åge Oterhals

I found this white cushion-formed ascomycete on ro

18-05-2026 19:49

Acrodontium sp?
William Slosse William Slosse

Good evening all,recently I found a portion of a S

18-05-2026 10:13

Teleomorph of Botrytis cinerea?
Lieve Deceuninck Lieve Deceuninck

Dear forum members,I identified this as the teleom

17-05-2026 22:09

Mollisia sp
éric ROMERO éric ROMERO

Bonjour tous, Je sollicite vos avis pour ce Molli

17-05-2026 19:05

Coenogonium pineti
Thomas Flammer

I have found this tiny 200 ym cup shaped apothecia

17-05-2026 16:41

Lachnum
Margot en Geert Vullings

We found this Lachnum on an old Rubus stem.Fruitbo

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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).