21-03-2026 15:13
Lepista ZacariasHello everyone, Does any one know of any literatu
20-10-2017 09:23
Garcia SusanaEste otro crecía en el mismo trocito de madera qu
20-03-2026 16:16
Edvin Johannesen
These 0.5 mm diam. acervuli were breaking through
19-03-2026 19:34
Filip Fuljer
Hello everyone,a few days ago I collected this str
19-03-2026 18:25
William Slosse
Good evening everyone, On 18/03/26 I found a few
17-03-2026 10:09
François Freléchoux
Bonjour, Voici la description rapide d'un petit d
19-03-2026 17:50
Enrique Rubio
Hi to everybodyThese thiny, blackish pseudothecia
Sydowiella or Melanconis teleomorph on Betula
Mathias Hass,
27-02-2026 16:17
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
Mathias Hass,
02-03-2026 08:11
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.
