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Images of British Lichens

Pertusaria lactea (L.) Arnold

Thallus white to cream or pale grey, smooth to cracked-areolate or somewhat warted, reacting red with sodium hypochlorite, KOH negative, delimited soralia scattered over the surface; apothecia rare. Locally common in the north and west on exposed, base-poor or somewhat calcareous rocks.

Refs: Smith et al. (2009), 683; Purvis et al. (1992), 455; Dobson (2005), 326-7 (photo); Dobson (2011), 327 (photo); Valcárcel et al. (2003), 294-5 (photo); Wirth (1995), 2: 696, 707 (photo); Wirth, Hauck & Schulz (2013), 2: 842, 1143 (photo, as Varicellaria lactea).

Pertusaria lactea
Pertusaria lactea (C+ red)
On coastal rock, Blar Mòr, Isle of Muck, June 2012, lower photograph showing C+ orange-red reaction
Pertusaria lactea
Pertusaria lactea
On upland rock, Braemar, Aberdeenshire, April 2003

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© A.J. Silverside
Uploaded May 2008, last modified or updated April 2014