Order: Lecanorales Family: Bacidiaceae
Species: Squamarina cartilaginea
Photos: Inland on calcareous rock. The Burren, Co. Clare, Ireland
Variable, thallus of pale yellow-green to brown-green squamules, +/- pruinose, forming loose or tightly overlapping crusts. Apothecia with brown to red-brown flat or concave discs that become irregularly convex with margins +/- excluded.
Scattered, mainly coastal distribution in Ireland in crevices in limestone cliffs and on hard calcareous rocks, mosses and soil.
Two chemotypes occur. Morphs with P+ yellow medulla appear confined to coastal sites, morphs with P- medulla also occur inland.
Squamarina cartilaginea July 2009