Rose-coloured pyrenos on Cirsium

11-02-2026 19:28

Peziza spec. from Germany

Lothar Krieglsteiner

on small deciduous twig on the ground in forest wi

25-04-2025 17:24

Cosmospora/Dialonectria spec.

Stefan Blaser

Hi everybody, This collection was collected by J�

09-02-2026 22:01

ruiz Jose

Hola, me paso esta colección en madera de pino, t

10-02-2026 17:42

Hélotiale blanche sur Sambucus racemosa

Bernard CLESSE

Bonjour à toutes et tous,Pourriez-vous me donner

10-02-2026 18:54

Unknown pink heliotale on sphagnum

Erik Van Dijk

Does anyone has an idea what fungus species this m

09-02-2026 20:10

(2 different or one ?) Hypoxylon from the Algarve – on Acacia and Arbutus

Lothar Krieglsteiner

The first 6 tables show surely one species with 2

09-02-2026 14:46

Cistella granulosella of Hyphodiscus incrustatus?

Anna Klos

Goedemiddag, Op donderdag 5 februari vonden we ti

09-02-2026 11:42

Lachnum sp.

Åge Oterhals

Hi forum, I found this Lachnum on old hardwood tw

02-02-2026 21:46

Dark disc on Populus

Margot en Geert Vullings

On a barkless poplar branch, we found hairy discs

07-02-2026 20:30

Azores and seven are described as new to science: Byssoloma fuscum, Lecania azorica, Sphaerellothecium heterodermiae, S. parmotremae, Stigmidium micareae, S. sub- cladoniicola, Thelocarpon microsporum.

Robin Isaksson

Hi!Anyone that have this one and can sen it to me?

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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?

Andgelo Mombert, 08-08-2023 15:06

Re : Rose-coloured pyrenos on Cirsium

Bonjour,
Je pense qu'il s'agit d'un Hydropisphaera. Il y a une clé de Lechat et Fournier dans la revue Ascomycete.org.
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.

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?

Regards,
Nick

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