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19-01-2020 10:45

Castillo Joseba Castillo Joseba

La hemos recolectado en frutos de EucaliptoA ver s

19-01-2020 10:59

Didier ARGAUD

Une question de mon ami Bernard Woerly qui voudrai

15-01-2020 00:11

William Slosse William Slosse

Hallo Forum,I recently found a curious ascomycetes

18-01-2020 19:03

BERNARD CLESSE BERNARD CLESSE

Bonsoir à toutes et tous,Une idée pour cet asco

18-01-2020 08:13

Juuso Äikäs

These were growing on the underside of a piece of

17-01-2020 23:49

Ethan Crenson

Hello again, I found this in a NYC park on very w

18-01-2020 12:40

Calzada Augusto Calzada Augusto

Hola amigos:Estoy estudiando una Gyalidea multispo

18-01-2020 11:51

Castillo Joseba Castillo Joseba

Encontramos esta bellota de quercus con algun tipo

17-01-2020 22:42

Ethan Crenson

Hello all, This is from New York, growing on deco

16-01-2020 22:21

BERNARD CLESSE BERNARD CLESSE

Bonsoir à toutes et tous,J'ai trouvé récemment,

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Hypoxylon s.l.
Stefan Blaser, 08-11-2019 17:43
Hello everybody,

I'm stuck with this collection and in need of some help.

I found it on a lying Tilia Trunk.

Macro:
Stromata in patches of variable size and shape from about 0.5-5 cm in Diameter. Very inconspicuous because they are nearly level with the wood surface. Stromatal surface dark brown, smooth, with very inconspicuous perithecial mounds that are level with the stromatal surface. Stroma about 0.6-0.8 mm thick with rather hard (carbonaceous) tissue. Perithecia globose to slightly tubular or pear-shaped, about 0.4-0.5 mm in diameter. Stromatal tissue yields no KOH-Extract.

Micro:
Asci 115-130 x 7-8 µm, with a short stalk, with no reaction in Melzer or IKI. Spores brown, smooth, nearly equilateral to slightly inequilateral, with a straight, spore-length germ slit, 11.5-14.0 x 5.5-6 µm.

Thanks for any suggestions,

Best wishes,

Stefan
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Jacques Fournier, 08-11-2019 17:58
Jacques Fournier
Re : Hypoxylon s.l.
Hi Stefan,

no longer a Hypoxylon but a Biscogniauxia, B. cinereolilacina, host specific for Tilia.

The stromata are purplish when young and become blackish brown. Your detailed description fits well, including the often inamyloid reaction of the apical apparatus.

Nice find!

Jacques
Stefan Blaser, 08-11-2019 19:42
Re : Hypoxylon s.l.
Hi Jacques, thank you very much. In retrospect I'm wondering why I didn't consider the Genus Biscogniauxia...
 I'm very happy about this find as I'm always looking for species of Biscogniauxia, Nemania and Hypoxylon I don't know.

Stefan