At the first sight it is similar to the one posted here ("Ascomycete on Juniperus wood"; id 37442) and it was found in a similar habitat, a cliff over the see with Juniperus as the only vegetation. However, the spores are different. Here are some details of this one:
- Ascoma with perithecia, walls carbonized;
- Asci 8-spored, with dimensions up to 95 x 21 um;
- Spores first hialine, soon grey-brown, 3-septate, the septa thicker with age, some distoseptate, with dimensions:
(16.9) 17.4 - 20.3 (25.2) x (7.3) 7.7 - 9.3 (10.6) um
Q = (1.8) 1.9 - 2.5 (3) ; N = 38; Me = 19.1 x 8.5 um ; Qe = 2.3 .
- All parts with negative reaction to melzer; However, some very diffuse bluish tone appeared and the spores become clearly distoseptate.

I attach some photos of the specimen and of the corresponding microscopy.
Any help about any of them is welcome.
Thanks in advance,
zaca