Description: This variable coastal crustose lichen is essentially a plant of siliceous cliff overhangs and seashore crevices. It has a thick, warted, beige-brown to pale olive green thallus composed of loose granules or isidia — these often covering the whole surface. Discs are rare, large, twisted and dark brown. Throughout Ireland. [The concept of this species has recently been revised (2009) resulting in the recognition of a further species B. sipmanii. How B. scopulicola differs from B. sipmanii is as follows: B. scopulicola — a thickly isidiate thallus and very like the description given above with discs very rare or absent. B. sipmanii has a thin, irregularly cracked thallus and is richly fertile. This second species is known to occur in County Kerry.]

Key Identification Features:

• Coastal, crevice or underhang species of acid rock sometimes spreading to old Thrift cushions
• Thallus: beige to olive green, heavily granular or isidiate.

Original text submitted by Vince J. Giavarini

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

iNaturalist: Bacidia scopulicola at iNaturalist World Species Observations database.