Psorotichia pontresinae B. de Lesd.

Lichenised. Poorly known taxon.
Substrate:
Altitudinal distribution: subalpine belt (potential vegetation: open, taiga-like forests dominated by Larix decidua and/or Pinus cembra and Rhododendron)
Note: a species with a very thin, crustose, spreading grey (in the dry state) thallus, dispersed, red to purple, urceolate apothecia (0.4-0.6 mm in diam.) with entire, thick margins, a I+ blue hymenial gel, 8-spored asci, and broadly ellipsoid, hyaline, simple ascospores (16-21 × 9-13 μm); the generic placement is in need of re-evaluation; on submerged schistose boulders in streams at high elevation; only known from the type locality in the Western Alps (Switzerland).
Switzerland: Graubünden;