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05-07-2020 18:06

Castillo Joseba Castillo Joseba

Me mandan el material seco de Galicia, recolectado

05-07-2020 17:52

Juuso Äikäs

I found these growing on dead, fallen canes of Rub

05-07-2020 10:31

Castillo Joseba Castillo Joseba

me mandan el material de Galicia, recolectado en h

03-07-2020 17:47

Thomas Læssøe

see: https://svampe.databasen.org/observations/10

27-06-2020 13:21

Hardware Tony Hardware Tony

I wondered if anyone could help me with this ascom

04-07-2020 14:34

Zuzana Sochorová (Egertová) Zuzana Sochorová (Egertová)

Hello, I would like to ask you for help with idet

03-07-2020 21:06

Castillo Joseba Castillo Joseba

me mandan el material seco,, recolectado en plante

03-07-2020 20:54

Castillo Joseba Castillo Joseba

me mandan el material seco recolectado en rama de

03-07-2020 22:51

Viktorie Halasu Viktorie Halasu

Hello,I'd like to ask for help with a lichen. In w

02-07-2020 21:45

Castillo Joseba Castillo Joseba

me mandan el material seco, recolectado en  tallo

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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
  • message #59917
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  • message #59917
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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