Images of British Lichens
Lepraria incana (L.) Ach.
Thallus diffuse, thin, powdery (leprose), lacking a medulla or any marginal differentiation into lobes, pale grey to distinctly blue-grey, thallus generally K-, but underlying hyphae and often some of the surface tissue K+ purple-red, apothecia unknown. In shaded places on acid rocks, walls and tree-trunks, widespread and evidently common, but part of a complex of species that require thin-layer chromatography for certain identification. (Photograph shown here is named on morphological grounds.)
Refs: Smith et al. (2009), 538; Purvis et al. (1992), 346; Dobson (2005), 242 (photo); Dobson (2011), 248-9 (photo); Whelan (2011), 107 (photo); Wirth (1995), 2: 538 (photo), 541 (photo); Wirth, Hauck & Schulz (2013), 2: 680, 681 (photo); van Herk & Aptroot (2004, 2013), 232-233 (photo); Stenroos et al. (2011), 242 (photo); Lichen Atlas of the British Isles 4: 1974 (1999).
|On Birch (Betula) trunk, Paisley, Renfrewshire, March 2008|
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Uploaded March 2008, last updated December 2013