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20-04-2026 22:00

Malcolm  Greaves Malcolm Greaves

These pale yellow, hairy ascos were growing on cul

19-04-2026 21:23

Steve Clements

Bonjour, I found this anamorphic fungus on old pl

19-04-2026 20:46

Steve Clements

1 mm diameter approx spherical conidiophores on pl

12-04-2026 17:56

Hardware Tony Hardware Tony

Found on dead stems in February earlier this year

17-04-2026 19:16

Enrique Rubio Enrique Rubio

Hi to everybodyI would appreciate any assistance r

14-04-2026 05:32

Ethan Crenson

Hi all, A few weeks back a friend pointed out som

17-04-2026 15:14

Bruno Coué Bruno Coué

Bonjour.Récoltes du 16/04/2026, sur feuilles mort

12-04-2026 15:52

Gernot Friebes

Hi,I'm looking for help with this anamorph collect

14-04-2026 21:52

Gernot Friebes

Hi,found on dead leaves of Carex elata. Conidia: 4

16-04-2026 22:09

Buckwheat Pete

Hello, I'd like to ask about this older specimen:

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Sydowiella or Melanconis teleomorph on Betula
Mathias Hass, 27-02-2026 16:17
Mathias Hass
Hi,

Found this on Betula, rather fresh fallen twig. found February 24, Asserbo, Denmark

Groups of black ostioles protruding through a whitish disc.
Asci: 102-124 x 13,6 - 18,7 my, with prominent apical pore, IKI-.
Ascospores: 20,2 (16,8-25,0) x 8,9(7,8-11,5) my, Q=2,23 (2,05-2,69), n=20. 1-septate, hyaline with oily content.
Anamorph not seen.

I can't figure out whether this is Melanconis stilbostoma or Sydowiella ambigua ...also I'm uncertain what the difference is between them.
... any help appreciated.


Kind regards Mathias

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Mathias Hass, 02-03-2026 08:11
Mathias Hass
Re : Sydowiella or Melanconis teleomorph on Betula
I just realized that it cannot be Sydowiella ambigua, because the peritecia are stromatic and immersed in the substrate, so it must be the common Melanconis stilbostoma. Here is the description of S. ambigua by Munk from "Danish pyrenomycetes" 1957.
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