04-11-2025 09:07
Josep Torres
Hello.A suspected Hymenoscyphus sprouting on a thi
04-11-2025 12:43
Edvin Johannesen
Hi! One more found on old Populus tremula log in O
03-11-2025 21:34
Edvin Johannesen
These tiny (0.4-0.5 mm diam.), whitish, short-stip
28-10-2025 15:37
Carl FarmerI'd be grateful for any suggestions for this strik
03-11-2025 16:30
Hans-Otto Baral
Hello I want to ask you if you have found this ye
Orange discs... Orbilia?
Juuso Äikäs,
20-06-2019 14:58
I found these in a small grove, growing on a fallen trunk of a deciduous tree (Alnus incana and Prunus padus were the dominant trees). I've seen some photos and microphotos of Orbilia species and there seem to be similarities, so that would be my uninformed guess.
The spores were tiny, allantoid, about 2.5 x 1 micrometers in size. Photographing was quite difficult as they were spinning in the liquid. The asci were ca. 30 x 3 ?m. Paraphyses mostly capitate, some filiform.
Any thoughts about the genus/species?
Lothar Krieglsteiner,
20-06-2019 18:02
Orbilia delicatula
... as far as the name ist still current (former xanthostigma).
Best, Lothar
Hans-Otto Baral,
20-06-2019 20:47
Re : Orange discs... Orbilia?
We returned to O. xanthostigma by using O. leucostigma for the white taxon, as in old times. Within Europe it is easy to give these two names for the yellow and white populations. In both the curved spores are warted when looking with oil immersion. And they are not forms but very distant species.
Zotto
Zotto
Juuso Äikäs,
20-06-2019 20:59
Re : Orange discs... Orbilia?
OK, so Orbilia xanthostigma it is then. And I guess the spores are reniform rather than allantoid. Thanks to both of you. A new genus and species for me!
Hans-Otto Baral,
20-06-2019 21:01
Re : Orange discs... Orbilia?
Wel, reniform, cashew-shaped, or even allantoid, why not.
Martin Bemmann,
20-06-2019 22:37
Re : Orange discs... Orbilia?
or "comma shaped" as in archaeology:
;-)
Martin
Hans-Otto Baral,
20-06-2019 22:42
Re : Orange discs... Orbilia?
and yes, crescent is another word for this.
Chris Yeates,
21-06-2019 21:43
Re : Orange discs... Orbilia?
Hörnchen - but not squirrel-shaped ;-)