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04-04-2025 13:33

Ayuda con esta
Castillo Joseba Castillo Joseba

me mandan el material de Galicia (España) recolec

03-04-2025 12:44

Discomycete
Castillo Joseba Castillo Joseba

Me mandan en matgerial seco de Galicia (España),Â

04-04-2025 11:56

Mollisia associated with algae on wood?
Edvin Johannesen Edvin Johannesen

These 0.2-0,4 mm diam. flat to slightly convex, gr

03-04-2025 15:33

Trematosphaeria?
Tomaz Vucko Tomaz Vucko

Hello! I found an interesting dothideomycete in a

03-04-2025 21:31

Lachnum deflexum (Cistella deflexa)
Francois Guay Francois Guay

Hi, I found this interesting ascomycete on incuba

03-04-2025 18:26

Coprophilous hairy perithecium
Lennert Gees

Hello there!I found this species on dung of an unk

03-04-2025 16:45

Busco ayuda para esta
Castillo Joseba Castillo Joseba

Me mandan el material seco de Galicia (España), 

01-04-2025 23:18

Neonectria et autre
Yanick BOULANGER

BonsoirRécolté par un ami sur dans un tas de bra

29-03-2025 09:08

Daldinia microscopie essai
Martine Vandeplanque Martine Vandeplanque

Bonjour.J’ai essayé d’étudier un Daldinia.Qu

30-03-2025 10:24

Hymenelia prevostii/Clauzadea immersa
Gonzalez Garcia Marta

Good morning, I would like to know the opinion of

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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).