Porina alpina (Bagl. & Carestia) Lettau

Syn.: Sagedia alpina (Bagl. & Carestia) Jatta, Segestrella alpina Bagl. & Carestia, Verrucaria alpina (Bagl. & Car.) Stizenb.
Lichenised. Poorly known taxon.
Substrate: siliceous rocks
Altitudinal range: from the subalpine belt (potential vegetation: open, taiga-like forests dominated by Larix decidua and/or Pinus cembra and Rhododendron) to the alpine belt (potential vegetation: treeless Alpine grasslands and tundras, to the lower limit of perennial snow and the equilibrium line of glaciers)
Note: a long-forgotten species with a subgelatinous-subleprose thallus, small, brownish-black perithecia, the wall black only in the upper half, subcylindrical, 6-8-spored asci, sparse, filiform paraphyses, and fusiform, acute, 3-7-septate, hyaline ascospores measuring 29-37 × 7-9 µm; only known from the type collection, on soil in the alpine belt; the type material (probably in MOD) is worthy of further study.
Italy: Piemonte;