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20-02-2026 18:47

Nectriopsis oropensoides on Fagus?
Marc Detollenaere Marc Detollenaere

Hello Forum,On rotten wood of Fagus, I found some

07-02-2023 22:28

Fracchiaea callista? on Carpinus
Ethan Crenson

Hello friends, On Sunday, in the southern part of

19-02-2026 17:49

Ayuda con Tarzetta sp
Salvador Emilio Jose

Hola buenas tardes!! Necesito ayuda para la ident

09-02-2026 22:01

Sp
ruiz Jose

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

19-02-2026 13:50

Hairy disc-"Patinella sanguineoatra" like
Margot en Geert Vullings

We found this collection on deciduous wood on 7-2-

19-02-2026 12:01

Ayuda con esta
Castillo Joseba Castillo Joseba

Me mandan el material de Galicia (España), recole

17-02-2026 09:41

Diaporthe spiculosa?
Maren Kamke Maren Kamke

Good morning, I found a Diaporthe species on Samb

16-02-2026 21:25

Pyreno in the bark of Lonicera xylosteum
Andreas Millinger Andreas Millinger

Good evening,failed to find an idea for this fungu

08-12-2025 17:37

Cucurbidothis parmeliarum (pithyophila var. cembrae) - on Abies
Lothar Krieglsteiner Lothar Krieglsteiner

20.6.25, on branch of Abies infected and thickened

17-02-2026 17:26

Recherche biblio Lambertella WHETZEL 1943
Nicolas Suberbielle Nicolas Suberbielle

Bonjour à tous, Je recherche cette publication :

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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).