Images of British Lichens
Physcia tenella (Scop.) DC.
A very small, foliose lichen, the lobes with long marginal cilia and usually with terminal soralia on the turned up undersides of the mature lobe-tips, lobe surfaces often dotted with black pycnidia; apothecia frequent, shortly-stalked with blue-black or thinly pruinose discs. Widespread and often abundant on twigs, bark, walls and rocks, often in company with P. adscendens, Phaeophyscia orbicularis and Xanthoria species, as indicators of nitrogen enrichment. Now often the dominant lichen on trunks of trees urban areas. (Note that Hypogymnia physodes also has sorediate, up-turned lobe-tips and can look similar, but it is generally larger and lacks marginal cilia.)
Refs: Smith et al. (2009), 702; Purvis et al. (1992), 468; Dobson (2005), 341 (photo); Dobson (2011), 342 (photo); Whelan (2011), 131 (photo); Nordic Lichen Flora (2002) 2: 38, 99 (photo); van Haluwyn et al. (2009), 90-1 (photo); van Herk & Aptroot (2004, 2013), 302-303 (photo); Valcárcel et al. (2003), 310-11 (photo); Wirth (1995), 2: 726, 727 (photo); Wirth et al. (2004), 119 (photo); Wirth, Hauck & Schulz (2013), 1: 870, 59 (photo), 872 (lower photo); Frahm et al. (2010), 137 (photo); Hansen & Anderson (1995), 55 (photo); Moberg & Holmåson (1984), 202 (photo); Holien & Tønsberg (2008), 79 (photo); Stenroos et al. (2011), 360 (photo); Brodo et al. (2001), 559 (photo); Hinds & Hinds (2007), 399 (photo); McCune & Geiser (2009), 272 (photo); Lichen Atlas of the British Isles 3: 1120, 1121 (1998).
Lichenicolous fungi on this host include Athelia arachnoidea, Illosporiopsis christiansenii, Marchandiomyces aurantiacus and M. corallinus.
|On Hawthorn (Crataegus monogyna), Longniddry, East Lothian, 2007|
|On Lime (Tilia × europaea), Paisley, Renfrewshire, June 2008|
|Calfhey, Lancashire, June 2009, dry and damp|
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Uploaded June 2008, last updated December 2013