10-06-2026 23:08
éric ROMERO
Bonjour tous, Je vous propose un Mollisia trouvé
10-06-2026 12:54
Steve ClementsBonjour encore, Pouvez-vous m'aider, s'il vous pl
09-06-2026 18:32
Camille MertensSur morceau de roseau immergé 0,5 - 0,7 mm de dia
10-06-2026 21:16
François Freléchoux
Bonsoir,Le dernier du jour, en attendant votre avi
10-06-2026 21:07
François Freléchoux
Toutes les tiges de gentianes jaunes de l'an passÃ
10-06-2026 13:41
François Freléchoux
Bonjour à nouveau, Voici une trouvaille d'hier.
10-06-2026 11:53
Steve ClementsBonjour, This disco is abundant on dead stems of
10-06-2026 10:45
François Freléchoux
Bonjour à nouveau, Encore une détermination qui
08-06-2026 10:16
Spooren Marco
I don`t have a clou about this fungus,it is not in
10-06-2026 09:24
François Freléchoux
Bonjour, J'imagine que cette détermination ne do
Hi to all,Found this fungus on wood (unknown) in Southeast Brazil.
I believe it is a Biscogniauxia species: no pigments in KOH, stromata carbonaceous, ascospores with conspicuous germ slit, growing on the bark (not on the wood itself).
I didn't have much time to work with this fungus, but I made some measurements of the ascospores: 11-12.5 x 6.5-7.5
I checked the paper of Ju et al. 1998 (Mycotaxon 66:1-98).
According to them, there are 5 species and 2 vars. (capnodes, capnodes var. Rumpens, capnodes var. Theissenii, communapertura, divergens, mediterranea and sinuosa) reported from Brazil, and using the key I reached B. capnodes, mainly because of the ascospores size and perithecia seldom sharing a commom ostiole.
Could someone confirm if I'm in the right path? I'm not familiar with this genus, in fact this is my first time dealing with it. :0)
P.S.: sorry for some bad photos.
Biscogniauxia-cf.-capnodes-0001.pdf
this is very likely B. capnodes.
A photo of a stroma in vertical section, just broken, would be very informative as to the size of perithecia, their shape and their arrangement, let alone the thickness of the stroma itself.
Cheers,
Jacques
Thank you very much for the help.
The perithecia are separated each other by a carbonaceous layer, i.e. locules with individual perithecia, easily removed, variable in size (up to 500 micra width and 600 high - a measured only few ones) and shape, most of them assuming a cordate shape.
I'm in doubt what do you mean with "let alone the thickness of the stroma itself" but I think that the photos have the information that you asked.
Thanks again,
Dartanha
Perithecial shape and arrangement fit well. B. capnodes.
It is not uncommon, you will find it again.
Best,
Jacques
Having the identity confirmed I also got the identification of a second fungus in the same sample: Pseudocosmospora joca, since according to Herrera et al 2013 (Mycologia 105:1285-307) Cosmospora-like growning on Biscogniauxia spp. were transferred to Pseudocosmospora, and P. joca is the only species known in this host. Next week I will post that fungus here.
Thank you very much.
All the best,
Dartanha