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Alan Silverside's Lichen Pages
Ochrolechia parella (L.) A.Massal.
Thallus crustose, usually warted, pale grey or tinged with buff, soredia absent (unless the result of a fungal infection, see Dobson); apothecia usually abundant, thick-rimmed, with pale pink-brown disks, but with the disk surface usually covered by a thick, grey-white pruina. Widespread and often common on base-poor rocks and walls, sometimes on nutrient-poor tree bark.
Refs: Smith et al. (2009), 629; Purvis et al. (1992), 399; Dobson (2005), 284-285 (photo); Dalby & Dalby (2005), 21 (photo); Jahns (1983), 254-255 (photo); Allen (2007), 18, 35 & 48 (photos); van Herk & Aptroot (2004), 262-263 (photo); Wirth (1995), 2: 612; Moberg & Holmåson (1984), 207 (photo); Puntillo (1996), plate 26 (photo).
Photograph: South Uist, Outer Hebrides, July 2006
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Uploaded April 2008, last modified June 2010
