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13-09-2025 14:10

Wim de Groot

We found this hymenoscyphus on rubus fruticulosis.

13-09-2025 15:43

Edmond POINTE Edmond POINTE

Bonjour Christian,J'ai trouvé deux spores ressemb

11-09-2025 16:57

Jason Karakehian Jason Karakehian

Our revision of Marthamycetales (Leotiomycetes) is

13-09-2025 14:01

Thomas Flammer

dark brown apothecia, splitIKI-Spores biguttulate

10-09-2025 23:53

Marcel Heyligen Marcel Heyligen

Found on Robinia pseudoacasia together with Diapor

10-09-2025 17:18

Blasco Rafael Blasco Rafael

Hola, encontre este estiercol de vaca estos apotec

02-09-2025 11:34

Thomas Læssøe

https://svampe.databasen.org/observations/10527903

07-09-2025 08:19

Josep Torres Josep Torres

Hello.Tiny pinkish discomycetes, photographed and

09-09-2025 12:07

Edmond POINTE Edmond POINTE

Bonjour amis mycologues,Trouvé sur moquette de ch

08-09-2025 19:07

ruiz Jose

Hola me pasan esta recolecta en madera de fraxinus

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Nitschkia parasitans on Graphostroma?
Gernot Friebes, 24-03-2015 11:31
Hi again,

as far as I'm aware Nitschkia parasitans is always described as growing on stromata of Nectria cinnabarina. However, I have received a collection that comes close to N. parasitans microscopically but grows on the margin of stromata of Graphostroma platystoma (on Castanea sativa). At least I don't know any other Nitschkia species with 8-spored asci and allantoid, hyaline ascospores which in the present fungus measure 9–11 x 2–2.5 µm. Maybe there is one that I overlooked? Or does N. parasitans indeed grow on fungi other than N. cinnabarina occasionally?
The long stipe of the dead asci is also quite remarkable. Munk pores are frequent and encircled by the dark, thickened cell wall. The macroscopic appearance is also a bit different from typical N. parasitans I think, because that species usually grows more densely fasciculate.

On a side note: it was very interesting to observe the ascomata upon rehydration because some of them quickly ejected a whitish conical "body" from which again the ascospores where visibly ejected under the stereo microscope. This must have been the "Quellkörper" which I have never seen in action before. Unfortunately I was at a microscope without a chance to take photos...

Best wishes,
Gernot     

PS: The attached photos are not mine.
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Jacques Fournier, 24-03-2015 14:52
Jacques Fournier
Re : Nitschkia parasitans on Graphostroma?
Hi Gernot,
I don't know your fungus but when run through Huhndorf and Mugambi's key (Mycologia, 102(1), 2010, pp. 185–210) it comes to the genus Coronophorella, with C. chaetomioides as the only species. Hope it helps...
Cheers,
Jacques
Gernot Friebes, 24-03-2015 21:08
Re : Nitschkia parasitans on Graphostroma?
Hi Jacques,

thanks for the suggestion. Nannfeldt describes the ascospores as shorter and wider than in this collection (6–8 x 2–3 µm; as "Nitschkia chaetomioides") and in the following link the ascospore size is also considerably shorter and wider (as "Scortechinia chaetomioides"): http://www.bcrc.firdi.org.tw/fungi/fungal_detail.jsp?id=FU200802050069. The description here: https://www-s.life.illinois.edu/pyrenos/records/show_by_page?page=114 fits better but unfortunately the images are not available. I think for now this fungus has to stay without a full name...

Best wishes,
Gernot