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03-09-2020 19:34

Mirek Gryc

HiAs in the title: on the parts of the Viscum albu

17-09-2020 11:07

Joop van der Lee Joop van der Lee

Normally Pilobolus are found on horse dung but thi

22-09-2020 18:27

Mirek Gryc

HiPlease give me a hint.Mirek

22-09-2020 15:22

Savic Dragisa

Hello everyoneI need help with this anamorph. Lea

20-09-2020 18:11

Castillo Joseba Castillo Joseba

De esta mañana  sobre madera posiblemente de Fag

21-09-2020 08:57

Castillo Joseba Castillo Joseba

De ayer en madera de FagusPelos hasta 1533µA ver

21-09-2020 12:36

Castillo Joseba Castillo Joseba

De ayer en rama de avellano (Corylus),   crfeo q

22-09-2020 12:15

Joop van der Lee Joop van der Lee

Found on dung pallets of roe deer.No living sprang

21-09-2020 15:55

Andgelo Mombert Andgelo Mombert

Bonjour à tous, Avec Gilbert, nous recherchons l

21-09-2020 20:34

Marcel Heyligen Marcel Heyligen

Hello anybodyI need help with the determination o

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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? 
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Hans-Otto Baral, 11-02-2020 22:22
Hans-Otto Baral
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.
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Hans-Otto Baral, 12-02-2020 10:52
Hans-Otto Baral
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" :).
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Hans-Otto Baral, 12-02-2020 17:30
Hans-Otto Baral
Re : Orbilia on Quercus
Thanks! This clearly excludes O. carpoboloides.
Hans-Otto Baral, 14-02-2020 22:07
Hans-Otto Baral
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
Hans-Otto Baral
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.