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(Map updated: 11 August 2009)

This loosely branching, light grey, cushion-forming (to 5cm high), rock and soil-inhabiting lichen is a common sight in upland areas. In Stereocaulon stems (pseudopodetia) support a grey mass of coral-like branches called phyllocladia. In S. vesuvianum the phyllocladia are tiny, rounded, lobed scales with dark-grey spotted centres. This distinguishes it from similar species. It grows widely on and among well-illuminated siliceous rocks. Discs are relatively common. Throughout Ireland.

Key characteristics

• Grey, coral-like and extensively cushion-forming; it is a major component of upland lichen communities on acid rocks; easily recognised by the dark-grey centres on the small, scale-like lobes
• An upright species, not flattened or arching.

Original text submitted by Vince J. Giavarini