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14-07-2025 11:20

Michel Hairaud Michel Hairaud

Bonjour, Voici une espèce de  (?) Hyaloscyphace

16-01-2023 21:31

Riet van Oosten Riet van Oosten

Hello, Nearby the find of Calycina claroflava on

14-07-2025 17:55

Yanick BOULANGER

BonjourAutre dossier laissé en suspendJe viens de

14-07-2025 11:17

Yanick BOULANGER

BonjourJ'ai un dossier Jackrogersella qui est rest

14-07-2025 15:52

Gernot Friebes

Hi,I wanted to share this collection on Rubus idae

14-07-2025 13:37

Gernot Friebes

Hi,do you think this collection could be R. ulmari

14-07-2025 11:19

Michel Hairaud Michel Hairaud

Bonjour, Voici une espèce de  (?) Hyaloscyphace

25-02-2023 18:36

Elisabeth Stöckli

Bonsoir, Trouvé sur un tronc de Salix recouvert

12-07-2025 16:45

Thierry Blondelle Thierry Blondelle

Bonjour à tous,J'avais d'abord pensé à des stro

05-07-2025 12:38

Åge Oterhals

I found this pyrenomycetous fungi in pine forest o

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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