Yes, but I suppose O. rosea, which is very difficult to distinguish. But
- the apos are rose
- the soil ist perhaps acidic because of Castanea
- the water is running which is typical for Anguillospora-like anamorphs

O. luteorubella has a Helicoon which is more adapted to standing water.

If you get the collection data, please tell me. You could also send me the photos in higher resolution to better see the spores.
Zotto

Thanks for sending pics in high resolution. Now I see clearer, but I overlooked the narrow spore width. This is neither of these species, but maybe the first record of Orbilia sinensis in Europe. For conformation this sample should be sequenced. The anamorph is expected to have completely different conidia, 1-celled, pyramidal with protuberances. But it was never observed on the substrate, always only in culture. Collections are known from USA and mainly China/Japan.

I suggest to send me the sample in air-dry state, and I will forward it.


Zotto
P.S. I must correct: Enrique (6143) made a collection in 2014 in Asturias. I commented as follows: A collection from Spain would represent the only European record of this species complex, but it is not included in the description because the spores are at the upper end of the range (*8.5–11.5 × 1–1.2 µm), also the apothecia were associated with anguillospora-like conidia.