05-08-2021 00:32
Khomenko Igor
Hi,I thought that this was a good fit for H. albid
04-08-2021 19:26
Enrique Rubio
Do you have any ideas for this setose Helminthosph
04-08-2021 23:16
Edvin Johannesen
Hi! I suspect I have a Trichopezizella with a hym
04-08-2021 18:35
Khomenko Igor
Hi,Is this Hymenoscyphus fraxineus, or do we have
04-08-2021 12:28
Thorben HülsewigHi there,two months ago i found this Lachnum on Cr
03-08-2021 21:18
Enrique Rubio
Growing on Sorbus aucuparia bark at 1300 m of alti
31-07-2021 23:33
Wilhelm Guggisberg
This 20 um, barreled shape, beer keg-like ascospor
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!