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Images of British Lichens

Rhizocarpon viridiatrum (Wulfen) Körb.

Initially a parasite of other crustose lichens, usually Aspicilia caesiocinerea; taking over the thallus and then persisting independently, thallus crustose, greenish yellow or still greyish where host is not fully suppressed, composed of dispersed to contiguous, angular to rounded areoles; apothecia flat, black, in microscopic section with a K+ faint-purple exciple, and a granular, brownish-black, K+ purple-red epithecium. On upland boulders, local in the north and west.

Refs: Smith et al. (2009), 808; Purvis et al. (1992), 542; Dobson (2005), 390-1 (photo); Dobson (2011), 395 (photo); Wirth (1995), 2: 804, 819 (photo); Wirth, Hauck & Schulz (2013), 2: 984 (photo).

Rhizocarpon viridiatrum
Rhizocarpon viridiatrum
On upland boulder amongst metalliferous mine-spoil, parasitising Aspicilia caesiocinerea, Nenthead, Cumberland, August 2012.
Unparasitised A. caesiocinerea is visible at the right-hand side of the photographs.

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© A.J. Silverside
Uploaded September 2012, updated September 2013