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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
 
Schismatomma_decolorans
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