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Our revision of Marthamycetales (Leotiomycetes) is
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Orbilia on Quercus
Juuso Äikäs,
11-02-2020 22:15
Hans-Otto Baral,
11-02-2020 22:22
Re : Orbilia on Quercus
Hi Juuso
where have you been seeking for a description? This is an interesting collection, and I am not able to tell you a name which I am happy about. You should try a median section and look for the margin if it is completely without any hair-like outgrowths. The microscopy recalls Orbilia carpoboloides (= Habrostictis rubra), but the substrate would be unusual and especially the margin should be distinctly fringed.
Also please look for contents in the living excipular cells .
Zotto
Juuso Äikäs,
12-02-2020 10:24
Re : Orbilia on Quercus
I'm quite bad at making sections but I tried to do some. The spores of O. carpoboloides would seem to fit quite well both in shape and size. I tried to search for paraphyses with mammiform tips (which would apparently be typical for that species) but didn't find any.
Hans-Otto Baral,
12-02-2020 10:52
Re : Orbilia on Quercus
Indeed this looks like hairs. In the excipular cells and also paraphyses I do not see the SCBs typical of carpoboloides. You are no able to photograph an apothecium at higher resolution in order to see if the margin is smooth or not?
Keep a herbarium specimen, maybe someone is interested.
Zotto
Juuso Äikäs,
12-02-2020 14:06
Re : Orbilia on Quercus
Here's a 40x image taken with my "ad hoc stereo microscope" :).
Hans-Otto Baral,
12-02-2020 17:30
Re : Orbilia on Quercus
Thanks! This clearly excludes O. carpoboloides.
Hans-Otto Baral,
14-02-2020 22:07
Re : Orbilia on Quercus
Hi Juuso,
although I do not want to discuss this species in the monograph I would be glad to note the collection data (date, locality, ...). Do you keep a herbarium?
Zotto
Juuso Äikäs,
14-02-2020 22:51
Re : Orbilia on Quercus
I can certainly provide the data (I don't have it at hand at the moment, I can send an email a bit later). I could also post a sample if you'd be interested. I don't have a proper herbarium, just some samples in sealable plastic bags in a drawer.
Hans-Otto Baral,
15-02-2020 09:28
Re : Orbilia on Quercus
Thanks. I have actually no time and at present no reson to study it, the finished monograph does not permit any further expansion. Maybe someone else is interested. A sequence would certianly be interesting.
Hans-Otto Baral,
09-11-2020 22:29
Re : Orbilia on Quercus
For completion: The sequence that Guy gained just mow falls unmistakably to Orbilia obtusispora, which would fit in the spore characteristics.