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Physcia adscendens (Th.Fr.) H.Olivier


Foliose, lobes with long marginal cilia and usually with helmet-like soralia at the tips; apothecia shortly-stalked with blue-black or thinly pruinose discs. Widespread and common on twigs, bark, walls and concrete, often in company with P. tenella and Xanthoria species as indicators of nitrogen enrichment. Generally more robust than P. tenella, with which it is usually mixed.

Refs: Smith et al. (2009), 700; Purvis et al. (1992), 467; Dobson (2005), 338 (photo); Dobson (2011), 339 (photo); Nordic Lichen Flora (2002) 2: 33, 97 (photo); Jahns (1983), 250-251 (photo); Whelan (2011), 130 (photo); van Haluwyn et al. (2009), 90-1 (photo); van Herk & Aptroot (2004, 2013), 296-7 (photo); Wirth (1995), 2: 726, 727 (photo); Wirth et al. (2004), 118 (photo); Wirth, Hauck & Schulz (2013), 2: 870, 872 (photo); Frahm et al. (2010), 133 (photo); Moberg & Holmåson (1984), 199 (photo); Stenroos et al. (2011), 352-3 (photo); Hansen & Anderson (1995), 53 (photo); Valcárcel et al. (2003), 306-7 (photo); Puntillo (1996), plate 31 (photo); Brodo et al. (2001), 549, 550 (photo); Hinds & Hinds (2007), 390 (photo); Walewski (2007), 121 (photo); McCune & Geiser (2009), 267 (photo); Lichen Atlas of the British Isles 3: 1112 (1998).

 
Physcia adscendens
On Sloe hybrid, Prunus domestica × spinosa, Wicken Fen, Cambridgeshire, April 2006


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© A.J. Silverside
Uploaded June 2008, last updated December 2013 (first hosted at www-biol.paisley.ac.uk, May 2006)