Punctelia borreri
≡Lichen borreri Sm., Engl. Bot. 25: pl. 1780 (1807).
Description : Flora (1985: 485).
Chemistry : Cortex K+ yellow; medulla K−, C+ rose, Pd−; containing atranorin, chloroatranorin, gyrophoric acid (major), ±orcinyl lecanorate, ±fatty acids.
N: Northland to Wellington. S: Nelson to Southland. Mainly lowland and coastal or in urban environments, widely distributed and moderately common on bark and lignum, rarely on rock. Known also from Great Britain, Europe, Scandinavia, North and South America, Hawai'i, and Australia (Hale 1965a; Purvis et al. 1992; Nimis 1993; Santesson 1993; Esslinger & Egan 1995; Elix & McCarthy 1998; Scholz 2000; Coppins 2002b; McCarthy 2003c, 2006; Nimis & Martellos 2003; Sérusiaux et al. 2003: 26–27; Egan & Aptroot 2004; Santesson et al. 2004).
Cosmopolitan
Illustrations : Galloway & Elix (1983: 399, fig. 1); Dobson (1992: 229; 2000: 261; 2005: 374); Longán et al. (2000: 371, fig. 1A, 372, fig. 2B); Van Herk & Aptroot (2000: 243, fig. 15); Kantvilas et al. (2002: 145); Sérusiaux et al. (2004: 151).
Punctelia borreri is characterised by: the corticolous (rarely saxicolous) habit; the black lower cortex; the apple-green upper cortex; pseudocyphellae that become sorediate; and by gyrophoric acid in the medulla. It is distinguished from P. subrudecta, which has a pale lower surface and lecanoric acid as the main medullary constituent.
