Accès membres

Mot de passe perdu? S'inscrire

04-07-2025 20:12

Josep Torres Josep Torres

Hello.A fungus growing on the surface of a trunk o

20-06-2025 08:33

Josep Torres Josep Torres

Hello.Small, blackish, mucronated surface grains s

28-06-2025 16:00

Josep Torres Josep Torres

Hello.A tiny fungus shaped like globose black grai

04-07-2025 12:43

Castillo Joseba Castillo Joseba

me mandan el material seco de Galicia (España) 

03-07-2025 18:40

Castillo Joseba Castillo Joseba

me mandas el material seco de Galicia (España) re

03-07-2025 20:08

Francois Guay Francois Guay

I found this interesting yellowish asco growing on

01-07-2025 23:37

Josep Torres Josep Torres

Hello.A Pleosporal symbiotic organism located and

02-07-2025 17:26

Yanick BOULANGER

BonjourRécolté sur une brindille au fond d'un fo

02-07-2025 18:45

Elisabeth Stöckli

Bonsoir,Sur feuilles d'Osmunda regalis (Saulaie),

02-07-2025 09:32

Nicolas VAN VOOREN Nicolas VAN VOOREN

Hello, bonjour.Here is the paper I'm searching for

« < 1 2 3 4 5 > »
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.
  • message #34690
  • message #34690
  • message #34690
  • message #34690
  • message #34690
  • message #34690
  • message #34690
  • message #34690
  • message #34690
  • message #34690
  • message #34690
  • message #34690
  • message #34690
  • message #34690
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