Placynthium tremniacum

Crustose terricolous, with trend to live in cracks, calcareous environments.
Note: all observed spores were uniseptated and clearly constricted at the septum, 9-12 x 6-7 micras.
For some authors, it´s synonimous of P. nigrum, we prefer to separate it.
Lithology: limestone
Altitude: 720 m
Municipality: Almócita