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09-12-2019 21:35

William Slosse William Slosse

Yesterday I found this species on the underside of

18-11-2014 11:05

Stip Helleman Stip Helleman

Dear friends,is there anyone who has for me the ar

09-12-2019 12:05

PASCAL DUBOC

Bonjour cette colonie de pustules orange sur vieu

10-12-2019 12:44

Castillo Joseba Castillo Joseba

Del pasado domingo en madera sin determinarA ver q

10-12-2019 11:40

Adrian Carter

If you are interested in Chaetomium you can access

04-12-2019 13:01

Mirek Gryc

Hello everyoneI inform you in advance that this is

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PASCAL DUBOC

Bonjour cette colonie de micro pustules noires l

09-12-2019 14:00

Pérez del Amo Carlos Manuel Pérez del Amo Carlos Manuel

Anamorfo sobre ramas sin identificar de restos de

08-12-2019 20:38

PASCAL DUBOC

cupules <2mm à centre gris bleuté, face exter

08-12-2019 11:01

Gilbert MOYNE

Bonjour, Un petit champignon que m'a remis Andgel

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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