Orbicula parietina on straw - Forum ASCOFrance

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Orbicula parietina on straw

William de Jong, 04-04-2021 19:35

Hi, a few days ago I found this fungi on a bunch of straw which had gotten wet. Attached to the substrate with a hyfal structure. Fruiting bodies up to 1.3 mm. The outer layer is relatively hard, it became dented due to drying (but it was smooth initially). The inside is yellowish containing round spores and, I think, crystals? The round spores seem to have a thick wall, which is ornamented with bumps. Spore size on average 10 µm (8,5-10,8 µm).
Does any of you have an idea what this might be?
Thanks in advance, William

Norbert Heine, 04-04-2021 21:01

Re : Fungi on straw

Hello, William, this should be Orbicula parietina.

Sincerely, Norbert

William de Jong, 05-04-2021 17:36

Re : Orbicula parietina on straw

Thank you very much Norbert!

I did some follow-up research and it fits the description of Orbicula parietina very well.
I think the peridium is two-layered, see pictures of exoperidium and endoperidium. The hyphal hairs seem to be constricted to the peridial base. Together with the spore size (8,9-10,3 x 9,3-10,9 µm) this should exclude Lasiobolidium orbiculoides.

Do you still agree with Orbicula parietina? A confirmation would be nice. :)