Images of British Lichens
Pertusaria hemisphaerica (Flörke) Erichsen
Thallus usually a thick, smooth or somewhat warted, white or pale yellowish- or blueish-grey crust, margin white, often zoned, soralia markedly hemispherical, concolorous with the crust or pale grey to pale cream, reacting carmine-red to sodium hypochlorite; apothecia unknown. Widespread, locally frequent though scarce in much of central and eastern England, generally on nutrient-rich, rough-barked tree trunks in open areas, especially near the base where it can form conspicuous, extensive colonies, rare on rock
Refs: Smith et al. (2009), 682; Purvis et al. (1992), 455; Dobson (2005), 325-6 (photo); Dobson (2011), 326 (photo); van Haluwyn et al. (2009), 164-5 (photo); van Herk & Aptroot (2004, 2013), 288-9 (photo); Wirth, Hauck & Schulz (2013), 2: 843, 1143 (photo, as Varicellaria hemisphaerica); Valcárcel et al. (2003), 292-3 (photo).
|On Sessile Oak (Quercus petraea), Ardilistry, Islay, May 2011|
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Uploaded October 2011, last updated December 2013