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Lepraria lobificans Nyl. (as morphospecies)
Thallus a diffuse, rather thick, powdery crust, pale to greenish blue-grey, with a white medulla, granules commonly with a weft of projecting cottony hyphae; apothecia unknown. On rocks, walls and tree-trunks, especially where sheltered from direct rain, widespread and evidently common, including in urban areas, 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), 242-3 (photo); van Herk & Aptroot (2004), 232-233 (photo); Brodo et al. (2001), 396-7 (photo); Lichen Atlas of the British Isles 4: 1629 (1999).
On Lime (Tilia x europaea), Kindrogan, Perthshire, March 2008
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Uploaded September 2008, last modified June 2010
