quelques images?

selon l'image N°7, ça ne ressemble pas à un Capronia,
Christian

Among the images I have in my files C. pulcherrima seems to fit.

Could you please check IKI, if it stains the asci or the hymenial gel in reddish? If not sure, a clearer result can be obtained when KOH-pretrated (then hymenium turns pale blue). Probably not all Capronias have that hemiamyloid reaction, but many.

I saw only the two spore photos, not the 7 photos which Christian mentioned.

Schmid-ascomyceten im Bild 1&2_Page_214.jpg?

Zotto

Hi Alain,

I agree with Zotto that this species resembles to C. pulcherrima due to ascospore morphology but in this species the ascospores rarely exceed 15 µm in length and mostly are less than 5 µm wide. The size of your ascospores fits better for C. semi-immersa (=C. svrcekiana according to Untereiner et al. 2008 in Botany, 86(7): 742-750) which is known from wood and old polypores. You find illustrations and descriptions of this species in:

Candoussau, F. & Sulmont, P. 1972 [1971]. - Dictyotrichiella semiimmersa nov. sp. Rev. Mycol. 36(3-4): 238-242.

Janex-Favre, M.C. 1988. - Étude ontogénique et structurale des périthèces du Dictyotrichiella semiimmersa Candoussau et Sulmont (Pyrénomyctètes, Herpotrichiellaceae). Cryptogamie, Mycol. 9(2): 133-151.

Réblová, M. 1996. - Two new Capronia species from the Czech Republic. Czech Mycol. 49(2): 77-83 (as C. svrcekiana).

Capronia species with submuriform ascospores are a difficult group though and it would be necessary to take cultures of many collections to find out more about the delimination of the species.

Best wishes,

Gernot

Thanks, Gernot, that helps a lot!! Anyhow I would be happy to know the iodine reaction which is currently neglected in the literature.

Zotto

Hi friends,
I'm reading the discussion.
I'm agree with you, it can't be C. pulcherrima, because of ascospores'size. Ascospores look like nigerrima's ones. But it isn't this fungicolus species. So I will look at semi-immers and  I'm about to  test KOH+ iode reaction at once.
I talk you soon,
alain

No iodine reaction with or not with KOH.
Gernot, I haven't found one of the descriptions. Untereiner only is on line and it doesn't give the description of the teleomorph.
I add : setae up to 30 µm long and ascomatal wall is 10-15 µm wide.
Thanks to all of you,
Alain

Very probably C. semi-immersa, as you said Gernot. You're a boss with Capronia !
Thank you,
Alain
PS : an important number of ascomatas were actually semi-immersed and host is Populus.

Avec les correspondances que j'ai eues avec Martina Reblova (1998)et Wendy Untereiner des cultures étaient nécéssaires pour établir la synonymie avec C.svrcekiana et placer D .semi im vimersa dans les Capronia mon matériel était trop vieux..Ou en de me le dire est-on ,??Merci de me le dire!