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03-12-2025 20:02

Godronia sp.
Buckwheat Pete

Hello everyone, does anyone know the genus Godroni

02-12-2025 18:59

Round spores asco
Malcolm Greaves Malcolm Greaves

This pair of ascos 2.5cm across were on recently b

02-12-2025 19:25

Lasiosphaeriaceae
Buckwheat Pete

Hello, can anyone identify this hairy fungus growi

02-12-2025 14:28

Urceolella crispula?
Mirek Gryc

527 / 5 000Hello everyoneThey grew on dead shoots

30-11-2025 12:53

Calycina cf. languida
Edvin Johannesen Edvin Johannesen

White short-stipitate apothecia found on thin twig

30-11-2025 10:47

Peziza fimeti or granulosa
William Slosse William Slosse

I recently found a collection of small Peziza sp.

27-11-2025 12:01

Valsa/Cytospora on Cryptomeria bark - Denmark
Thomas Læssøe

https://svampe.databasen.org/observations/10496727

27-11-2025 11:46

another loculo on Aesculus with muriform spores - Denmark
Thomas Læssøe

https://svampe.databasen.org/observations/10493918

17-09-2025 10:50

Ascomycete on Polystichum proliferum
Heather Merrylees

Hi there!I am hoping for any advice on the identif

29-11-2025 08:40

Small hyalin discomycete on Fagus
Andreas Millinger Andreas Millinger

Hello,on a splintered part of a branch on the grou

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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).