Hello.
An anamorph photographed under holm oaks this past Sunday. Apart from the holm oaks, there were only Buxus and Juniperus in the area. So, despite the leaf being distinct from the surrounding ones, I must assume it was an oak leaf. Although I can't confirm this either, the saprophytic ascomycete only affected this leaf, and no matter how hard I looked, I couldn't find any other affected leaves.
Blackish ascomata, like deformed grains between 0.25 and 0.30 mm, sprouting scattered over the upper surface of the leaf.
Conidiogenous hyphae arranged in parallel, between 10 and 30 microns long, produced fusiform, glusky-walled conidia with three distinct septa, slightly constricted, the two central cells more pigmented, and the ends slightly mucronate and hyaline, no apparent reaction to Melzer's Reagent.
These conidia measured in water:
(20.1) 20.6 - 24.5 (24.8) × (7.1) 7.6 - 8.5 (8.9) µm
Q = (2.4) 2.6 - 3 (3.3) ; N = 40
Me = 22.7 × 8.1 µm ; Qe = 2.8
On this occasion, I admit I'm completely lost.
Any feedback from you would be greatly appreciated.
Thank you in advance.
Best regards.