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02-05-2025 10:16

Asco noir sur tige morte d'Angelica sylvestris
Bernard CLESSE Bernard CLESSE

Bonjour à toutes et tous,Pourriez-vous m'aider à

12-05-2025 18:52

Fungus on Pseudoralfsia algae
Gonzalez Garcia Marta

Buenas tardes, estoy estudiando un hongo peritecio

12-05-2025 18:25

Coprotus spec.
Thomas Flammer

Substrate rabbitSpores: 12-13 µm x 6-7 µmParaph

10-05-2025 18:47

Hyphomycetes
David Chapados David Chapados

Hi, Does anyone have an idea of what this could b

11-05-2025 17:57

Vibrissea (?) sur pétiole de feuille de salix
Louis DENY

Hello forumTrouvé dans les environs de Belfort,al

08-05-2025 20:50

Greyish aquatic asco
Andreas Jacob

Good evening, due to contstant drought I started

11-05-2025 10:22

Velutarina-like disco
Karl Soler Kinnerbäck

Found on moist Betula wood dipped in freshwater st

11-05-2025 10:35

Ascobolus en excremento de jabali
ruiz Jose

Hola, en excremento de jabali, tamaño de unos 2 m

05-05-2025 10:09

Crotte de lièvre
Nicolas Suberbielle Nicolas Suberbielle

Re-bonjour,Cet ascomycète trouvé et étudié par

09-05-2025 16:01

Chaetosphaerella phaeostroma (Anamorphe Oedemium minus).
Thomas Flammer

I found a black cushon which might eventually be 

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Hypoxylon petriniae ?
Thierry Blondelle, 12-03-2023 10:11
Thierry BlondelleHello !
I'm a new member from France.
I require your advise for this sample of Hypoxylon found on a dead branch of Fraxinus.
I think to H. petriniae with these inconspicuous perithecal mouds.
Ascospores: 12-10 x 4-5 µm with double guttula in most of them.

Thanks

Thierry Blondelle
  • message #75492
  • message #75492
Lothar Krieglsteiner, 12-03-2023 10:21
Lothar Krieglsteiner
Re : Hypoxylon petriniae ?
Hello Thierry,
can you tell us which color the pigment extracted with 10% KOH has?
Yours, Lothar
Thierry Blondelle, 12-03-2023 10:39
Thierry Blondelle
Re : Hypoxylon petriniae ?
Hello Lothar,

Pigment seems to be orange.
  • message #75494
Jacques Fournier, 12-03-2023 15:53
Jacques Fournier
Re : Hypoxylon petriniae ?
Hi Thierry,
you are likely right, but H. petriniae may be highly variable in colour and external appearence, making its identification sometimes challenging.
A good discriminating character from other species with orange pigments is the relatively weak thickness of the stromata, rarely over 0.5 mm thick, combined ith the small diameter of perithecia, mostly 0.3-0.4 mm diam.
Cheers,
Jacques
Thierry Blondelle, 12-03-2023 18:06
Thierry Blondelle
Re : Hypoxylon petriniae ?
Thanks Jacques for these additionnal informations.