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10-08-2022 15:45

Pierre-Yves Julien

Récolte le 31/07/2022 – Ozoir-la-Ferrière (77)

04-07-2022 18:45

Enrique Rubio Enrique Rubio

I can find no suitable answer for this white Bryos

11-08-2022 08:16

Josep Torres Josep Torres

Hola.Un muy diminuto Pirenomyceto sobre un tronco

11-08-2022 00:45

Stefan Jakobsson

On a thin deciduous stick (Salix/Alnus/Betula) on

10-08-2022 09:11

Josep Torres Josep Torres

Hola.Un Piremomyceto recogido este pasado domingo

10-08-2022 18:45

François Bartholomeeusen

Good evening all, On 5 August 2022, a friend gave

09-08-2022 20:06

Stephen Mifsud Stephen Mifsud

I have found an interesting aspergillus on flowers

06-08-2022 22:20

Marcus Yeo

I found this ascomycete today on dead leaves of Er

16-07-2022 17:01

Zetti Mario

Hi, I am doing some work with microfungi and durin

02-08-2022 17:48

Pierre-Yves Julien

Récolte le 31/07/2022 – Ozoir-la-Ferrière (77)

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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