28-12-2025 12:08
Margot en Geert VullingsThis possible Karstenia was found on the bark of d
21-12-2025 21:32
Pol DebaenstHello, Garden, Burgweg 19, Veurne, BelgiumOn 10/1
26-12-2025 21:19
Arnold BüschlenPithyella chalaudii Priou. Ist als Bryoparasit in
21-12-2025 09:32
Josep Torres
Hello.A tiny ascomycete found embedded in wood in
18-12-2025 21:17
Pol DebaenstThe identification took me to Byssonectria deformi
24-12-2025 17:08
Hulda Caroline HolteHello, I have found this propoloid ascomycete on
Hypoxylon petriniae ?
Thierry Blondelle,
12-03-2023 10:11
Hello !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
Lothar Krieglsteiner,
12-03-2023 10:21
Re : Hypoxylon petriniae ?
Hello Thierry,
can you tell us which color the pigment extracted with 10% KOH has?
Yours, Lothar
can you tell us which color the pigment extracted with 10% KOH has?
Yours, Lothar
Thierry Blondelle,
12-03-2023 10:39
Re : Hypoxylon petriniae ?
Hello Lothar,
Pigment seems to be orange.
Pigment seems to be orange.
Jacques Fournier,
12-03-2023 15:53
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
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
Re : Hypoxylon petriniae ?
Thanks Jacques for these additionnal informations.