Orbilia on Quercus - Forum ASCOFrance

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Orbilia on Quercus

Juuso Äikäs, 11-02-2020 22:15

These were growing on a thin, fallen branch of Quercus robur in an open, grassy area. The place wasn't particularly moist, no standing or running water nearby. The spores measure 10.5-14.1 x 2.3-2.7 um (water, spore print). Paraphyses variable in shape, most clavate, some cylindrical-spathulate-submoniliform. Some of them had some resin or something on the tips. I've been searching information but haven't found a species that fits this combination. What do you think?

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.

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