03-02-2026 20:44
Zetti MarioWhen I first saw this white mould on an Agaricus s
18-08-2025 15:07
Lothar Krieglsteiner
.. 20.7.25, in subarctic habital. The liverwort i
02-02-2026 21:46
Margot en Geert VullingsOn a barkless poplar branch, we found hairy discs
02-02-2026 14:55
Andgelo Mombert
Bonjour,Sur thalle de Lobaria pulmonaria.Conidiome
02-02-2026 14:33
Andgelo Mombert
Bonjour,Sur le thalle de Peltigera praetextata, ne
31-01-2026 10:22
Michel Hairaud
Bonjour, Cette hypocreale parasite en nombre les
02-02-2026 09:29
Bernard CLESSE
Bonjour à toutes et tous,Pour cette récolte de 2
01-02-2026 19:29
Nicolas Suberbielle
Bonjour, Marie-Rose D'Angelo (Société Mycologiq
31-01-2026 09:17
Marc Detollenaere
Dear Forum,On decorticated wood of Castanea,I foun
we need your help with this curious ascomycete on twigs of Magnolia. Here are a few key characters:
-) Ascomata glabrous, non-stromatic, sitting rather loosely on/between conidiophores of a hyphomycete (asexual morph of the same species?)
-) Asci apparently bitunicate, reaction strongly to IKI, maybe with a slight amyloid reaction of the (inner?) wall
-) Ascospores faintly striate, 12.5-14 x 4.3-5.2 µm
Thanks for any ideas!
Best wishes,
Gernot
Letendraea helminthicola looks a lot similar (based on Ellis & Ellis). I don't know what other species are in this genus.
Viktorie
Hello Germot,
I acompletely agree with Viktone that this is Letendraea. Ihave two collections of this seemingly rare ascomycete: once from Cumbria and recently from the gerden here in Argyll
Peter
thanks a lot for your help! I think the genus is pretty clear now indeed. I'm still a bit irritated by the faintly striate ascospores, however. After quickly reading through some descriptions of L. helminthicola I didn't find this feature mentioned, in fact two sources (Dennis in British Ascomycetes and Akulov 2015) explicitly write "smooth" regarding the spore surface. If anyone has further insight into this I would really appreciate it.
Best wishes,
Gernot
could the ornamentation be soluble in some reagent, e.g. KOH, MLZ? Or either soluble or unstainable in LACB?
edit: Akulov used 3% KOH.
Viktorie
I would have to check that. For now all I can say is that the striation is very faint but still well visible in water; both myself and the person who collected the material observed it independently of each other. But if one doesn't look carefully it could certainly be missed.
Best wishes,
Gernot
Best wishes,
Gernot
