20-01-2012 18:45
Enrique Rubio
Hi to all:I have collected this Hypoxylon species
20-01-2012 19:11
Ron BronckersGood evening, Who has access to all the 25 volume
18-01-2012 09:54
Illescas Tomás
Bonjour:Quelqu'un a d'information bibliographique
15-01-2012 11:04
Alain BRISSARDBonjour à tousCette espèce de Sordaria, trouvée
14-01-2012 20:22
Uwe Lindemann
Dear friends, I would be very happy if somebody ha
10-01-2012 23:15
Ridha EL MOKNIBonsoir chers Mycologues,Je m'excuse pour avoir Ã
08-01-2012 18:20
Enrique Rubio
Hi to all again:These nice stromata where collecte
16-07-2011 18:29
Luc Bailly
Tourbière, haute Ardenne. Par acquis de conscienc
Hypoxylon on Quercus robur bark
Enrique Rubio,
20-01-2012 18:45
Hi to all:I have collected this Hypoxylon species that grows on Quercus robur bark, at 150 m of altitude, with pulvinate, coalescent and purplish grey stromata. KOH extractable pigments are chlorinaceous-olive. Asci IKI and Mlz. blue. Ascospores with a spore-lenght, straight to sigmoid, germ slit. Perispore dehiscent in KOH 10%.
The stromata seem to have ochraceous granules just beneath the surface.
Maybe Hypoxylon porphyreum or only an Hypoxylon fuscum?.
Many thanks again for help me
Enrique
Yannick Mourgues,
20-01-2012 19:10
Re : Hypoxylon on Quercus robur bark
Bonjour. Entre les deux, ma préférence irait vers Hypoxylon porphyreum.
Par contre, sur mon écran, la couleur de la réaction dans KOH sur ta photo est jaune ? Qu'en est-il vraiment ?
Yannick
Par contre, sur mon écran, la couleur de la réaction dans KOH sur ta photo est jaune ? Qu'en est-il vraiment ?
Yannick
Enrique Rubio,
20-01-2012 19:37
Re : Hypoxylon on Quercus robur bark
Bonsoir Yannick:
La couleur du papier est ocracée mais avec des nuages olive aussi. Il nèst pas jaune pure.
Enrique
La couleur du papier est ocracée mais avec des nuages olive aussi. Il nèst pas jaune pure.
Enrique
Jacques Fournier,
20-01-2012 20:46
Re : Hypoxylon on Quercus robur bark
Hola Enrique,
it is hard to tell but H. porphyreum might indeed be the best match. The KOH reaction appears yellow because it is recorded on paper, on which the yellow fraction migrates first, it is in fact a basic chromatography. On your photo the colour just around the fragment of stroma is brownish, more in agreement with can be expected from H. porphyreum. I suggest you try to record the coloured reaction in a drop of KOH on a slide on a white background, the result should be easier to interpret.
If you have enough material I would be happy to see it, thanks!
Cheers,
Jacques
it is hard to tell but H. porphyreum might indeed be the best match. The KOH reaction appears yellow because it is recorded on paper, on which the yellow fraction migrates first, it is in fact a basic chromatography. On your photo the colour just around the fragment of stroma is brownish, more in agreement with can be expected from H. porphyreum. I suggest you try to record the coloured reaction in a drop of KOH on a slide on a white background, the result should be easier to interpret.
If you have enough material I would be happy to see it, thanks!
Cheers,
Jacques
Enrique Rubio,
22-01-2012 19:07
Re : Hypoxylon on Quercus robur bark
Merci Jacques. Je vais t'envoyer un petit morceau de mon récolte. Mais il tres petite.
Merci de ton aide
Enrique
Merci de ton aide
Enrique