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25-01-2026 23:23

Delitschia/Lojkania? on wood
Tomaz Vucko Tomaz Vucko

Hello! I found this species that resembles Delitsc

18-01-2026 12:24

Anamorph on an olive tree
Josep Torres Josep Torres

Hello.An anamorph located on the surface of a thin

25-01-2026 16:08

Geoglossum
Malcolm Greaves Malcolm Greaves

This Geoglossum had spores mostly 70-80 (87) with

23-01-2026 21:50

Looking for a paper please
Cameron DK

I am looking for this please publication. is anyon

10-01-2026 20:00

Lichenicolous fungus on Protoparmeliopsis muralis
Tom Schrier

Hi all,We found picnidia on Protoparmeliopsis mur

21-01-2026 19:55

Nemania aureolutea?
Bohan Jia

Hi,  Could this be Nemania aureolutea? Or did I

21-01-2026 16:32

Lichenicolous coelomycete
Gernot Friebes

Hi,I need your help with some black dots on a lich

21-01-2026 16:48

Hyphomycete on Rubus fruticosus agg.
Gernot Friebes

Hi,after my last unknown hyphomycete on this subst

20-01-2026 17:49

Mollisina acerina ?? Turbinate and hemiamyloid
Hardware Tony Hardware Tony

I offer this collection as a possibility only as e

15-01-2026 15:55

pyrenomycete on Quercus
Lothar Krieglsteiner Lothar Krieglsteiner

this one is especially interesting for me because

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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.