Orbicula parietina on straw - Forum ASCOFrance

14-07-2025 11:20

Une hélotiale sur Sphagnum palustre

Michel Hairaud

Bonjour, Voici une espèce de (?) Hyaloscyphace

16-07-2025 17:34

Sphaerulina cornicola versus Septoria cornina

Bernard Declercq

Hello,I have trouble distinguishing above mention

15-07-2025 13:27

literature request

Angel Pintos

Hello, does anyone have access to the following ar

16-01-2023 21:31

Troposporella fumosum => Troposporella monilipes

Riet van Oosten

Hello, Nearby the find of Calycina claroflava on

14-07-2025 17:55

Hypoxylon cf ticinense

Yanick BOULANGER

BonjourAutre dossier laissé en suspendJe viens de

14-07-2025 11:17

Jackrogersella minutella VS Hypoxylon cohaerens var. microsporum

Yanick BOULANGER

BonjourJ'ai un dossier Jackrogersella qui est rest

14-07-2025 15:52

Olla aff. millepunctata (croziers +) on Rubus idaeus

Gernot Friebes

Hi,I wanted to share this collection on Rubus idae

14-07-2025 13:37

Rutstroemia ulmariae(?) on Saxifraga rotundifolia

Gernot Friebes

Hi,do you think this collection could be R. ulmari

25-02-2023 18:36

Nectria

Elisabeth Stöckli

Bonsoir, Trouvé sur un tronc de Salix recouvert

12-07-2025 16:45

Sur écorce de Hêtre

Thierry Blondelle

Bonjour à tous,J'avais d'abord pensé à des stro

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. :)