16-01-2026 00:45
Ethan CrensonHi all, On decorticated hardwood from a New York
08-12-2025 17:37
Lothar Krieglsteiner
20.6.25, on branch of Abies infected and thickened
10-01-2026 20:00
Tom SchrierHi all,We found picnidia on Protoparmeliopsis mur
13-01-2026 07:28
Danny Newman
Chlorociboria glauca on indet. decorticate logThe
15-01-2026 15:55
Lothar Krieglsteiner
this one is especially interesting for me because
13-01-2026 08:43
Danny Newman
Tricladium varicosporioides on indet. decorticate
07-01-2026 22:22
Danny Newman
Tatraea sp. on indet. hardwood The Swag, Great Sm
13-01-2026 09:10
Danny Newman
Dasyscyphella chrysotexta on indet. decorticate ha
on a trouvé cet Orbilia sur le bois de bouleau. Les petits et grands ascocarpes, tous les deux, avaient les mêmes caractéristiques microscopiques.
Hi,
We found this Orbilia growing with Mollisia-type ascos on a birch log. Both the glassy-looking small ascocarps and the larger opaque ones had the same microscopy. The ascocarps were small (up to 0.65 mm) and large (up to 2.2 mm).
Paraphyses had swollen heads up to 3.5 um wide.
Asci were 35-45 x 3-4.
In my books I was unable to find a bright yellow Orbilia with spores of these dimensions ie 7-8.5 x 2-2.5.
Steve
Hello Steve,
I think you give pictures of two different discomycetes. The spores you measured are not from an Orbilia (maybe a Hymenoscyphus or Bisporella, as the macrofotos look like), but the next picture with the asci is. In this asci I see minute roundish spores, and I think this is what was earlier determined as Orbilia coccinella (s.l.). Zotto surely knows more, but this for the moment.
Regards from Lothar
I even think it is O. xanthostigma with reniform warted spores
Zotto
Zotto was right - the small one is Orbilia xanthostigma - and so is the large yellow one. Over 10 days they have both developed mature knobbly reniform spores. It's a very big Orbilia at 2.2 mm!
The spores which confused me were from the nearby Mollisia type asco.
That was a real mystery,
Thanks,
Steve
