19-05-2026 10:27
Patrice TANCHAUDBonjour, récolte récente sur terre retournée i
04-06-2026 18:39
Gernot FriebesHi,I collected this species in two different locat
22-05-2026 13:29
Gernot FriebesHi,I am curious to hear your opinion on this mater
04-06-2026 10:50
François Freléchoux
Bonjour, J'ai trouvé hier un petit asco observé
04-06-2026 07:02
François Freléchoux
Bonjour, Voici la description d'une espèce qui p
04-06-2026 13:34
Gernot FriebesHi,I am interested to hear your opinion on this Le
04-06-2026 11:36
Gernot FriebesHi,found on Vaccinium myrtillus.Asci: IKI –, 8-s
18-10-2022 00:12
Valencia Lopez Francisco JavierHola amigos/asRecientemente encontré esta colecci
Hi to allThis fungus forms subcuticular pseudothecia (¿?) under the periderm of stems of Arundo donax. These pulvinate and ostiolate ascomata, arranged in longitudinal lines, are singly or situated on small stromata with some other ones, 0.4-1.5 mm long, up to 0.15 mm high.
The 8-spored asci are cylindrical and I think they are bitunicate altough I can see maybe a small structure near the apex. The golden brown bi-cellular ascospores and the pseudoparaphyses are showed in the pics. I tough could be a Didymella or a close related genus, but I don't know a good genus for this collection.
Have you some ides for it?
Thanks again
not sure but your fungus looks like a Roussoella. If so the spores should be delicately longitudinally ribbed, it's difficult to see if the preparation is not very thin.
The smaller spores with broadly rounded ends would fit R. donacicola (Speg.) Ju, Rogers & Huhndorf which is common on this host. The slightly larger and more narrowly elliipsoid are less typical of this species and recall a tropical species, R. chiangraina (in Phytotaxa 181(1), 2014).
Saludos,
Jacques
Hi Jacques
Fantastic! I feel you are right, although the faint striate ornamentation is hardly visible. But the rest of the generic characters fits well with this fungus.
Thanks a lot!