Hello.
A probable Hyaloscypha from last June 1st, sprouting on the debarked wood of a sloping trunk on the deciduous forest floor, where the most abundant species in the area were hazel (Corylus) and oak (Quercus).
Whitish apothecia measuring between 0.20 and 0.50 mm in diameter.
Marginal hairs with pointed tips, short septa at their bases, and measuring (55.9) 60.3 - 92.8 (102.3) × (3.3) 3.4 - 5.3 (5.6) µm.
Exciple hyphae arranged more or less parallel, measuring (9.3) 12.5 - 16.7 (18.4) × (4.5) 4.8 - 6.5 (8.9) µm.
Octosporic asci, with a timid reaction of their tiny apical apparatus to the Melzer, and measuring (39.6) 40.3 - 44.8 (46.2) × (5) 5.2 - 5.7 µm.
Free ascospores cylindrical, with a somewhat pointed end and measuring in water:
(6.4) 6.6 - 8.4 (8.8) × (1.5) 1.6 - 2.2 (2.3) µm
Q = (3.2) 3.3 - 4.6 (5) ; N = 24
Me = 7.4 × 1.9 µm; Qe = 3.9
And the mature spores inside the ascus have very similar measurements: (7.2) 7.23 - 8.4 × (1.7) 1.71 - 2.06 (2.1) µm.
Based on their characteristics, my first choice would be Hyaloscypha, and taking into account the substrate, perhaps even Hyaloscypha daedaleae or Hyaloscypha quercina, but it turns out that in both cases they have a spore width greater than my suggestion. I have also been unable to find any other option within the genus with such narrow spores.
Any feedback from you would be welcome.
Thank you very much in advance.
Best regards.