Images of British Lichens
Lepraria umbricola Tønsberg
Thallus diffuse, powdery (leprose), lacking a medulla or any marginal differentiation into lobes, dull- to blue-green or blue-grey, thallus K+ bright yellow (but thallus surface not easily wetted and reaction said to be best in acetone extract), apothecia unknown. In dry, shaded places on acid rocks and trunks in humid and usually oceanic woodland, widespread but more frequent in the north and west. Part of a complex of species that require thin-layer chromatography for certain identification.
Refs: Smith et al. (2009), 540; van Herk & Aptroot (2004, 2013), 234-5 (photo); Lichen Atlas of the British Isles 4: 1716 (1999).
|On base of Oak (Quercus) trunk in shady, oceanic woodland, Ardilistry, Islay, May 2011, BLS meeting|
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Uploaded February 2013, updated December 2013