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17-04-2026 19:16

Small dark synnemata on rotten hardwood
Enrique Rubio Enrique Rubio

Hi to everybodyI would appreciate any assistance r

14-04-2026 05:32

Pyrenomycete with yellow subiculum on Aralia
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Hi all, A few weeks back a friend pointed out som

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sur feuilles de Luzula
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Bonjour.Récoltes du 16/04/2026, sur feuilles mort

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Anamorph on Salix
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Hi,I'm looking for help with this anamorph collect

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Thyriothecioid anamorph on Carex elata
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Parorbiliopsis samarae?
Buckwheat Pete

Hello, I'd like to ask about this older specimen:

15-04-2026 19:33

Scutellinia cf. citrina
Fátima Durán Manzaneque

Hi!! I need help, I found this Ascomycete but I d

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Seeking genus for 1 – 3 septate spored asco. on herb Nepteta cataria (Mint).
Hardware Tony Hardware Tony

Found on dead stems in February earlier this year

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Unknown anamorph on Primula eliator
William Slosse William Slosse

In a dune grassland in Oostduinkerke (Belgium), on

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More fungi on Arundo donax
Enrique Rubio, 20-05-2016 19:20
Enrique RubioHi to all

This 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

  • message #42846
  • message #42846
  • message #42846
Jacques Fournier, 20-05-2016 19:39
Jacques Fournier
Re : More fungi on Arundo donax
Hpla Enrique,
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
Enrique Rubio, 20-05-2016 20:46
Enrique Rubio
Re : More fungi on Arundo donax

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!