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Lasallia pustulata (L.) Mérat
'Rock-tripe'
A large, foliose species, with rounded thalli attached centrally, upper surface with conspicuous, convex, scabrid-pruinose pustules, brown to whitish grey when dry, brownish to yellowish green when wet, margins with dense tufts of black isidia; apothecia rare. On rocks in upland areas, local and predominantly western.
Refs: Smith et al. (2009), 451; Purvis et al. (1992), 281; Dobson (2005), 199-200 (photo); Jahns (1983), 230-1 (photo); Wirth (1995), 1: 439 (photo); Moberg & Holmåson (1984), 159 (photo); Holien & Tønsberg (2008), 103 (photo); Puntillo (1996), plate 21 (photo).
In dry state, on base-poor rock in moorland, Dartmoor, Devon, August 2008
In wet state after heavy rain, on base-poor rock in moorland, Dartmoor, Devon, August 2008
On montane rocks, Glencoe, Argyllshire, April 2009
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Uploaded September 2009, last modified June 2010
