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01-05-2024 23:22

long-necked anamorph embedded in wood
Ethan Crenson

Hi all, Found late last week in a New York City p

29-04-2024 21:32

Yellowish asco on Pteridium aquilinum
Robin Isaksson Robin Isaksson

Hi! Found in Sweden. Ascomata with haris, se

01-05-2024 12:54

Pyreno sobre filipendula
F. JAVIER BALDA JAUREGUI

Hello, everyone.An idea for this pyreno, I found u

30-04-2024 16:59

Peziza vesiculosa
Sylvie Le Goff

Bonjour. Petite pézize récoltée au sol en bordu

30-04-2024 19:43

Hyphomycete on Calypogeia suecica
Gernot Friebes

Hi!We observed this hyphomycete growing between le

30-04-2024 16:08

asco aquatique
maurice pelissier maurice pelissier

BonjourTrouvé dans un torrent de montagne au Chir

30-04-2024 16:22

Could this be Ciborinia pseudobifrons?
François Bartholomeeusen

Dear forum members,On April 25 2024, I found one f

29-04-2024 21:51

Anamorph with very large dark round conidia found on Cedrus
Mathias Hass Mathias Hass

Hi everyone, Found on attached branches of top pa

28-04-2024 18:05

Pseudoophiobolus (?) sur Teucrium botrys
Bernard CLESSE Bernard CLESSE

Bonsoir à toutes et tous,J'ai trouvé ce matin ce

28-04-2024 13:30

Pale Trichopeziza
Juuso Äikäs

On Friday I found these pale, hairy little discos

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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
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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).