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Images of British Lichens

Stereocaulon evolutum Graewe

Thallus greyish white, initially squamulose but then with tufts of prostrate to arched, pale pinkish-orange branches (pseudopodetia) bearing abundant, flattened, uniformly pale, deeply crenate to lobed scales (phyllocladia), the largest phyllocladia usually as wide as the pseudopodetia, soralia absent, small, brownish cephalodia produced amongst the phyllocladia; thallus testing faintly yellow with Pd (para-phenylenediamine);; apothecia brown (to dark brown?), rare. On exposed, siliceous rocks, mainly in the north and west, locally common in upland areas.

Refs: Smith et al. (2009), 861; Purvis et al. (1992), 580; Dobson (2005), 415 (photo); Dobson (2011), 421 (photo, poorly printed); Jahns (1983), 224-5 (photos); Valcárcel et al. (2003), 352-3 (photo); Krog et al. (1994), 280 (photo); Stenroos et al. (2011) 434 (photo, atypical state).

Stereocaulon evolutum
Stereocaulon evolutum
Stereocaulon vesuvianum, studio close-up
On exposed, siliceous, glacial-erratic, moorland boulder, Loch Eriboll, West Sutherland, July 2012

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© A.J. Silverside
Uploaded August 2012; updated August 2013