These tiny (0.4-0.5 mm diam.), whitish, short-stipitate apothecia were collected on decorticated log of Populus tremula (estimated to have died and fallen ca. ten years ago) in Oslo. The excipulum and stipes somewhat darker than the hymenium, the entire ascocarps turning brownish upon drying. Asci clearly protruding beyond a dense palisade of rather thick, cylindric, septate paraphyses with large, somewhat refractive bodies in the upper part. Spores ca. 20-25 x 5 micr., somewhat fusiform, aseptate, curved, multiguttulate, biseriate in the upper part of asci. Asci clavate with a long base, without croziers (?), IKI+ (blue ring in Lugol).

Microscopically I think of Tatraea sp. Spores similar to T. macrospora, but that species does not occur in Europe (?). Also the apothecia are much smaller than any Tatraea I find in the literature. So I guess I am wrong. Any suggestions?  Microscopy done on fresh material in water.

Thanks!