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01-12-2023 21:54

Marian Jagers Marian Jagers

Does anyone recognize this species? Apothecia in

04-12-2023 08:32


Bonjour, récolte réalisée au sol dans un parc,

04-12-2023 10:01

François Bartholomeeusen

Dear forum participants, On a thin twig of Myrica

03-12-2023 19:21

ruiz Jose antonio

Hola a todos, en un talud cercano a un riachuelo,

28-11-2023 23:10

Villalonga Paco

On basic soil in humid bank, Teruel, Spain, around

02-12-2023 21:21

Elisabeth Stöckli

Bonsoir, Récolte en milieu incendié, apothécie

25-11-2023 14:49

Kees van Oorde Kees van Oorde

Very small fruiting bodies on affected leaves. Fou

30-11-2023 14:33

Béatrice Senn-Irlet

alll issues of Mycologia Helvetica (1983-2000) are

28-01-2014 10:50

Gernot Friebes

Hi,I'm looking for these three standard references

25-11-2023 18:14

Danny Newman Danny Newman

higher resolution images available at inaturalist.

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Rose-coloured pyrenos on Cirsium
Juuso Äikäs, 08-08-2023 14:07
These little pyrenos were growing on a dead stem of Cirsium sp. The perithecia are ~0.2 mm wide, and some appear to have a papillate ostiole. 

The asci are 8-spored and IKI negative. The spores are mostly 2-celled and measure 13.6 - 20.4 × 4.1 - 4.8 µm.

Maybe this is something in Nectriaceae, or something close to that?
  • message #76707
  • message #76707
Andgelo Mombert, 08-08-2023 15:06
Andgelo Mombert
Re : Rose-coloured pyrenos on Cirsium
Je pense qu'il s'agit d'un Hydropisphaera. Il y a une clé de Lechat et Fournier dans la revue 
Dans le bleu coton, les spores sont ornementées ?
Juuso Äikäs, 08-08-2023 17:36
Re : Rose-coloured pyrenos on Cirsium
Thanks for the reply. I found the paper, and the closest fit might be H. cirsii. The name sounds promising, and the substrate of my collection might very well be Cirsium arvense, like mentioned in the paper.

However, that species should have hairs, and the spores should be finely spinulose (although they did look rather smooth in the pic). My collection seems to have smooth spores in CB (I can't rule out some very fine ornamentation). The spore shape and measurements would be fairly close, as would the size and color of the perithecia.

Maybe I'll name this just Hydropisphaera sp.
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  • message #76709
Nick Aplin, 19-08-2023 21:18
Re : Rose-coloured pyrenos on Cirsium
Sorry for the late comment - Might it also be worth comparing this collection to Nectriella dacrymycella?