Hello.
Some tiny apothecia sprouting in a scattered but abundant manner on decaying leaves in the riverine forest under poplars (Populus).
The apothecia are blackish, only 0.2 to 0.3 mm in diameter, without a clearly distinct margin.
Under microscopy, I couldn't see any structures that could correspond to marginal hyphae; if they were present, they would be very few.
The excipule is very sparse, globose in texture, angular.
Octosporic asci, uniseriate, thick-walled, apparently without clear uncinules at their base, with measurements in water of (50.1) 56.1 - 70.8 (79.2) × (8.6) 9.3 - 11.4 (11.6) µm., Me = 64.9 × 10.4 µm., and with an amyloid apical apparatus to Melzer, cylindrical to slightly widened at its upper part, with measurements of 2.6 - 3.1 (3.4) × (2.1) 2.12 - 2.29 (2.3) µm. As a curiosity, I could not observe this apical apparatus in the preparations with Lugol. The paraphyses are filiform, septate, with a slight widening at the apex, protruding above the level of the asci.
Ellipsoidal ascospores, with one or more lipid droplets inside, inamyloid in the Melzer test, and with measurements in water of (8.2) 8.8 - 11.2 (11.4) × (5.4) 5.9 - 8 (8.4) µm, Me = 10 × 6.8 µm; Qe = 1.5.
Based on microscopy and the amyloid reaction of its apical apparatus, the closest I could find would be Drepanopeziza, but its appearance doesn't match.
Any feedback from you would be welcome.
Thank you in advance.
Best regards.