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Images of British Lichens

Schismatomma decolorans (Turner & Borrer ex Smith) Clauzade & Vӗzda

Thallus effuse, thin, whitish grey to lilac-grey or slightly pinkish or tinted ochre, becoming cracked into areoles, scratching yellow-orange (Trentepohlia photobiont), sometimes with a defined, black prothallus, surface becoming sorediate, thallus C- and Pd-; apothecia said to be convex, pruinose, but rare. Widespread, more common n the south, on dry, shaded bark, sometimes on shaded, dry rock-faces and stonework.

Refs: Smith et al. (2009), 835; Purvis et al. (1992), 560; Dobson (2005), 403 (photo); Dobson (2011), 408 (photo); van Herk & Aptroot (2004, 2013), 350-1 (photo); van Haluwyn et al. (2009), 156-7 (photo); Arup et al. (1997), 233 (photo); Thor & Arvidsson (1999), 320 (photo).

Schismatomma decolorans
On Holm Oak (Quercus ilex), Orielton, Pembrokeshire, May 2009, thallus yellow where scratched
Under overhang on wooded, ultrabasic rockface, Smeaton, East Lothian, June 2011, thallus yellow where scratched, material confirmed as C-.

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© A.J. Silverside
Uploaded February 2013, updated December 2013