Polyblastia quartzina Lynge

Lichenised.
Substrate: siliceous rocks
Altitudinal range: from the submediterranean/colline belt (potential vegetation: mixed deciduous forests dominated by Quercus and Carpinus) to the subalpine belt (potential vegetation: open, taiga-like forests dominated by Larix decidua and/or Pinus cembra and Rhododendron)
Note: a species with an epilithic, rimose, brownish-green thallus, rather small, semi-immersed ascomata with a diverging involucrellum in the lower part, and small, broadly ellipsoid ascospores with 1-3 transversal septa and a single longitudinal septum, based on a type from Novaya Zemlya on siliceous rocks (quartzite); widespread in Eurasia but apparently rare; in the so far only known from the Western Alps (France).
France: Alpes-Maritimes;