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15-09-2025 14:40

Nicolas VAN VOOREN Nicolas VAN VOOREN

Hello.I'm searching for a digital copy of the seco

14-09-2025 22:16

Philippe PELLICIER

Apothécies petites jusquà 3 mm, oranges, avec de

13-09-2025 14:01

Thomas Flammer

dark brown apothecia, splitIKI-Spores biguttulate

10-09-2025 17:18

Blasco Rafael Blasco Rafael

Hola, encontre este estiercol de vaca estos apotec

13-09-2025 14:10

Wim de Groot

We found this hymenoscyphus on rubus fruticulosis.

13-09-2025 15:43

Edmond POINTE Edmond POINTE

Bonjour Christian,J'ai trouvé deux spores ressemb

11-09-2025 16:57

Jason Karakehian Jason Karakehian

Our revision of Marthamycetales (Leotiomycetes) is

10-09-2025 23:53

Marcel Heyligen Marcel Heyligen

Found on Robinia pseudoacasia together with Diapor

02-09-2025 11:34

Thomas Læssøe

https://svampe.databasen.org/observations/10527903

07-09-2025 08:19

Josep Torres Josep Torres

Hello.Tiny pinkish discomycetes, photographed and

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Hypoxylon rubiginosum?
Enrique Rubio, 18-07-2011 18:55
Enrique RubioHi to all:

These resupinate stromata grow on wood of Fagus sylvatica. KOH 10% extractable pigments are orange red but peripherically purplish. Asci have an apical apparatus Mlz. negative but bluish in IKI.
Could be H. rubiginosum?

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Enrique Rubio, 18-07-2011 19:43
Enrique Rubio
Re : Hypoxylon rubiginosum?
Dear René:

No smell I have noted, perithecia are 375-575 microns high and stromata are small (only 3-4 cm)
Enrique
Jacques Fournier, 18-07-2011 20:59
Jacques Fournier
Re : Hypoxylon rubiginosum?
Hi Enrique,
I guess  you studied it in detail because it seemed a bit strange to you. The results of your chromatography are indeed surprising.
I would be glad to see it and I will forward it to Marc to study its HPLC profile.
Thanks in advance,
Jacques
Enrique Rubio, 19-07-2011 12:13
Enrique Rubio
Re : Hypoxylon rubiginosum?
OK., Jacques. I will send you my material

Best wishes
Enrique
Jacques Fournier, 28-09-2011 10:44
Jacques Fournier
Re : Hypoxylon rubiginosum?
Dear Enrique,
I eventually received your specimen, thanks!
I wonder if two different Hypoxylons were not mixed up in your collection because I failed to see any purplish tinge around the orange pigments obtained on a paper with KOH, following your method.
Ascal rings also differ from what you observed in that they turn blue in Melzer and IKI as well.
I first though your fungus might be H. canariense, so far known only from Canary Islands where it is very common, in which I sometimes observed dubious reactions of ascal rings to iodine, but I do think the one you sent me is a depauperate form of H. rubiginosum.
Many undescribed species of Hypoxylon likely are still to be discovered, most of them  resembling H. rubiginosum in gross morphology. Keep on screening them!
With best wishes,
Jacques
Enrique Rubio, 28-09-2011 12:31
Enrique Rubio
Re : Hypoxylon rubiginosum?
Many thanks for your study, Jacques
Enrique