Description: Rare, this species is known only from West Galway. It grows on mosses (for example, Andreaea) on boulders rather high up above the 700m contour where snow is late to melt. The grey to dark grey thallus consists of warty aggregation of granules bearing convex, blue-grey frosted discs. The thallus is UV+ blue-white.

Key Identification Features:

• On mosses in the high uplands, especially in areas of late snow lie
• Thallus granular-warty, discs blue-grey pruinose; spores simple, ellipsoid.

Original text submitted by Vince J. Giavarini

Distribution Map from NBN: Frutidella caesioatra at National Biodiversity Network mapping facility, data for UK.

iNaturalist: Frutidella caesioatra at iNaturalist World Species Observations database.