
05-07-2025 12:38
Åge OterhalsI found this pyrenomycetous fungi in pine forest o

04-07-2025 20:12
Hello.A fungus growing on the surface of a trunk o

20-06-2025 08:33
Hello.Small, blackish, mucronated surface grains s

28-06-2025 16:00
Hello.A tiny fungus shaped like globose black grai

04-07-2025 12:43
me mandan el material seco de Galicia (España)

03-07-2025 18:40
me mandas el material seco de Galicia (España) re

03-07-2025 20:08

I found this interesting yellowish asco growing on

01-07-2025 23:37
Hello.A Pleosporal symbiotic organism located and
The subhymenium (layer 5 in Donadini) consists of a narrow layer composed of a mix of textura intricata with elements of t. globosa-angularis. Medullary excipulum is made up of 3 distinct layers. The upper layer (layer 4) is wide (600µm) and made up of textura globosa with some cells reaching 175µm in diameter. The middle med. excipulum (layer 3) consists of a narrow layer (220µm) of t. intricata with some globular elements reaching 50µm diameter. The lower med. excipulum (layer 2) consists of a wider (250µm) layer of t. angularis (some elements up to 70µm wide). The ectal excipulum (layer 1) is a dark coloured layer (360µm thick) composed of t. intricata.
Asci 280 x 13µm, pleurorhynchus base. Paraphyses slightly inflated at the tips (6 - 9µm), septate, hyaline. Ascospores Mean 17.2 x 10.2µm; Qe = 1.69, ellipsoid, hyaline, eguttulate, rough (but no specific ornamentation seen with CB not with oil immersion unfortunately; when examining images, at high contrast, one can see a central oil drop which is not visible normally - perhaps an artifact of my setup.
The species appears somewhere between arvernensis and pseudosylvestris (particularly the wide upper med.excipulum) but P. pseudosylvestris is not a European species. Donadini separates the 2 species by the very wide 2 & 4 layers which this collection appears to have, but the spores do not show particular ornamentation. Has anyone collected P.arvernensis which such wide layers?

P. arvernensis has clearly verrucose ascospores, so it's important to check this character.

I had not considered P. varia as the middle t. intricata should be visible as a distinct layer.
I forgot to post a TS section before. In the attached image there is no distinct middle layer, but I have never seen P. varia, so I may be wrong.

Hello,
in contrast to Nicolas I do believe that the spores are verrucose. In my opinion the smooth spores of Peziza varia agg. are withour any content and are completely smooth. the shown spores do have something inside or on the spores. I believe it is an ornamentation.
best regards,
Andreas
The spores do not appear to be smooth. Varying the focus there seems to be some roughness on the surface but maybe because I did not use oil immersion it is difficult to be certain. Even if the spores are verrucose the medullary excipulum width is rather large for P. arvernensis. This was the reason for my post, as this is the first time I found this species I wanted to have opinions on what to look for to get a more confident identification.