20-05-2016 19:20
Enrique Rubio
Hi to all This fungus forms subcuticular pseudoth
19-05-2016 19:11
Enrique Rubio
Hi again Could yo help me with this fungus on ste
20-05-2016 12:19
Castillo Joseba
en una rama en la que hay dos especies, esta apa
18-05-2016 18:11
Bernard CLESSE
Bonsoir à tous, Je renvoie ce message car appare
19-05-2016 12:36
Castillo Joseba
en tronco de quercus muy descomnpuestoNo tengo ni
19-05-2016 18:30
Lothar Krieglsteiner
... found in the Bavarian Forest near Frauenau, ab
18-05-2016 12:09
Enrique Rubio
Hi to all These minute (up to 0.35 mm) urceolate
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!