Pale 4-spored pyrenomycete - Forum ASCOFrance

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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

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?

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.

see https://www.ingentaconnect.com/content/nhn/pimj/pre-prints/content-nbc-persoonia-0612

(sheet 1329, pages 262-263).

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