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23-05-2026 11:44

Charles Grapinet Charles Grapinet

Hello, I am having trouble identifying this copro

22-05-2026 21:35

Steve Clements

Bonjour, I expected this find on old wood on our

22-05-2026 18:12

Lothar Krieglsteiner Lothar Krieglsteiner

... in moist chamber from Portugal.As the fungus s

22-05-2026 20:08

Ethan Crenson

Hello all,  Yesterday in NYC I was visiting an e

11-01-2022 16:36

Jason Karakehian Jason Karakehian

Hi does anyone have a digital copy of Raitviir A (

20-05-2026 17:47

Margot en Geert Vullings

We found this Mollisia on dead Juncus stems mown l

22-05-2026 14:47

Gernot Friebes

Hi,superficial ascomata collected on bark of a liv

22-05-2026 14:44

Lothar Krieglsteiner Lothar Krieglsteiner

in unripe condition citrine yellow, then soon fadi

22-05-2026 13:29

Gernot Friebes

Hi,I am curious to hear your opinion on this mater

22-05-2026 10:59

Nicolas VAN VOOREN Nicolas VAN VOOREN

Trouvé sur Phragmites, ce que je pense être un L

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Nectria mammoidea?
Björn Wergen, 14-12-2011 01:11
Björn WergenHi,

I just need a confirmation that I am on the right way with my new Nectria finding on Fraxinus. Perithecia 0,2-0,4mm, with distinct darker ostiole region, orangered to dark red. Spores smooth (?), up to 20x8µm, mostly with a single septa, but some spores with a second septa, thickwalled. Asci with 8 spores. Wall up to 40-50µm thick.

thanks and regards,
björn
  • message #16861
  • message #16861
  • message #16861
Christian Lechat, 14-12-2011 05:12
Christian Lechat
Re : Nectria mammoidea?
Dear Björn,
It could be Neonectria ditissima (Tul. & C. Tul.) Rossman & Samuels

Christian
Björn Wergen, 14-12-2011 09:59
Björn Wergen
Re : Nectria mammoidea?
Hi Christian,

yes, the ditissima was my second opinion, in Nordic Macromycetes (Vol 1) it seems not really clear what "Perithecia uniformly coloured" means (the perithecia were not uniformly coloured). If I select this way, I come directly to N. ditissima with spores around 14-21x5-8µm, which fits well to my finding. 

I know that I have some Nectria-keys somewhere on my PC. If you have some helpful docs, please let me know, I am very interested in pyrenos at all and especially Nectria, Valsa, Diaporthe, Pleospora and so on :D

regards,
björn