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Mot de passe perdu? S'inscrire

29-12-2025 17:44

Lamprospora ? laquelle ?
Isabelle Charissou

Bonjour,J'aimerais savoir si d'autres personnes au

29-12-2025 17:51

En Rosmarinus
Blasco Rafael Blasco Rafael

Hola, me pueden ayudar con esta muestra.Recogida s

29-12-2025 17:12

asco imparfait et oïdium sur tige morte de Polygonatum odoratum
Bernard CLESSE Bernard CLESSE

Bonjour à toutes et tous,Pourriez-vous m'aider à

12-11-2021 00:03

White dots on pine
Lepista Zacarias

Hi everybody,A week ago in my fiels trip I noticed

29-12-2025 17:01

Hyphomycete on Rubus fruticosus agg.
Gernot Friebes

Hi,I'm looking for help with this hyphomycete with

29-12-2025 08:30

Ascomycete among bryophytes.
Josep Torres Josep Torres

Hello.A tiny ascomycete sprouting under Juniperus

29-12-2025 10:15

Propolis sp. on Pinus sylvestris
Hulda Caroline Holte

Hello, I found and collected this propoloid ascom

29-12-2025 09:38

Phaeohelotium on deciduous wood?
Oskari Virtanen

Hi,could anyone help me identify this, I suspect P

24-12-2025 18:12

Orbilia
Ethan Crenson

Hello all, A friend found this Orbilia growing on

28-12-2025 12:08

Karstenia? anamoph?
Margot en Geert Vullings

This possible Karstenia was found on the bark of d

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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).