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05-06-2020 06:41

Jérôme MAFFERT

Bonjour, il semble bien que Tuber aestivum Vitt. s

06-06-2020 23:06

Garcia Susana

Hola, Estos apotecios crecian sobre un tallo de

04-06-2020 18:28

Malcolm  Greaves Malcolm Greaves

HelloCan someone help with this long necked flask

05-06-2020 13:53

Peter Thompson

Hello Everyone,I would be interested in your opini

06-06-2020 17:17

Robin Pétermann

J'ai également trouvé ce Lachnum sur Filipendula

06-06-2020 20:25

Juuso Äikäs

I know next to nothing about these kinds of fungi

06-06-2020 19:03

Robin Isaksson Robin Isaksson

Found this mycogaena on populus on smooth twigs in

06-06-2020 16:48

Robin Pétermann

Bonjour,j'ai trouvé ceci sur tige morte de Filipe

06-06-2020 07:19

Juuso Äikäs

These were growing on a dead, fallen stem of Filip

05-06-2020 19:29

Mirek Gryc

Hi! I am convinced that I have already seen these

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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