Syn.: Leptogium aquale (Arnold) P.M. Jørg., Leptogium pusillum Nyl. var. aquale Arnold
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 minute species, somewhat resembling S. biatorinum, with a blackish-brown, mainly crustose-granular thallus, the granules paraplectenchymatous throughout, apothecia frequent (to 0.5 mm in diam.), sessile, with concave to flat, pale brown discs, and occasionally with a crenulate thalline collar, in section with a proper exciple, with submuriform to muriform, relatively large ascospores (30-45 × 10-14 μm); on calcareous pebbles in a stream, so far only known from the Eastern Alps (Austria).
