On February 9, 2026, we found these small hairy discs on a dead branch of Acer.

Disc:
0.2-0.4 mm in size, sessile, underside dark, hairs lighter to the top, hymenium dark.

Structure:
Only textura intricata visible.

Hairs:
Hairs completely encrusted.
Encrustation loosens in KOH, no change in KOH + Melzers.

Asci:
Difficult to find due to the many hairs and paraphyses.
Measured in water: (43.2) 43.21 - 43.2 × 6.5 - 6.76 (6.8) µm, Q = 6.4 - 6.68 (6.7)
Croziers + we think.
IKI neg, also after KOH + Melzers J neg.

Paraphyses:
Cylindrical with sept.

Spores:
Hyaline with 2 guttules mostly at the poles, sometimes a few smaller guttules.
Measured in water: (6.8) 7.1 - 7.8 (8.2) × (2.2) 2.3 - 2.67 (2.7) µm, Q = (2.6) 2.8 - 3.2 (3.4)

Is it possible to say what genus and perhaps what species this could be?
Many thanks in advance, Geert&Margot