Images of British Lichens
Umbilicaria cylindrica (L.) Delise ex Duby
var. denticulata Ach.
Differs from var. cylindrica by the smooth undersurface, ± lacking rhizinomorphs, and the lobe margins being toothed or lacerate, projections flattened and in the same plane as the thallus. Distribution of the species: locally common on exposed rocks and boulders in the north and west, generally upland; the variety evidently widespread within this range (Kershaw, 1961).
Refs: Kershaw (1961), 256.
Probably simply a state that is not truly distinct from var. cylindrica.
|On exposed, siliceous, glacial-erratic, moorland boulder, Loch Eriboll, West Sutherland, July 2012|
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Uploaded August 2012