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Images of British Lichens

Umbilicaria deusta (L.) Baumg.

Thallus attached at central point, single or divided into multiple lobes, margins downturned, initially smooth above but becoming clothed with flattened or cylindrical isidia with age, greenish brown to dark brown, lower surface black, without rhizinomorphs (non-attaching rhizines), thalloconidia absent, regenerating from a black prothallus (fide B. Coppins); apothecia rare, gyrose. Widespread but local on exposed rocks and boulders in the north and west.

Refs: Krzewicka (2004), 33; Smith et al. (2009), 915; Purvis et al. (1992), 618; Jahns (1983), 226-227 (photo); van Herk & Aptroot (2004, 2013), 372-3 (photo); Wirth (1995), 2: 928, 933 (photo); Wirth et al. (2004), 139 (photo); Wirth, Hauck & Schulz (2013), 2: 1121, 1125 (photo); Moberg & Holmåson (1984), 154 (photo); Hinds & Stenroos et al. (2011) 460 (photo); Hinds (2007), 480 (photo); Brodo et al. (2001), 702 (photo); McCune & Geiser (2009), 344 (photo).

Umbilicaria deusta
Umbilicaria deusta
Umbilicaria deusta
Umbilicaria deusta, showing regeneration from prothallus
Umbilicaria deusta,  showing regeneration from prothallus
On exposed, ultrabasic (basalt/trachyite) rocks, Traprain Law, East Lothian, June 2011.
Lower photographs show regeneration from black, persistent prothallus (feature pointed out by Brian Coppins).

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© A.J. Silverside
Uploaded September 2011, last updated December 2013