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Physconia perisidiosa (Erichsen) Moberg
Foliose, thallus presumably green when wet, drying grey or grey-brown with tinges of mauve, lobes small, expanded towards the tips, with marginal and terminal lip-like soralia and isidiate towards the centre of the thallus, upper surface pruinose, undersides ecorticate at the tips, rhizines black, bottle-brush-like, medulla white; apothecia rare. Widespread but local on nutrient-rich bark, rarely on walls.
Refs: Smith et al. (2009), 705; Purvis et al. (1992), 472; Dobson (2005), 344; Nordic Lichen Flora (2002) 2: 41, 100 (photo); van Herk & Aptroot (2004), 306-7 (photo); Wirth (1995), 2: 729, 740 (photo); Moberg & Holmåson (1984), 203 (photo); Holien & Tønsberg (2008), 80 (photo); Brodo et al. (2001), 565-6 (photo); Hinds & Hinds (2007), 405; Lichen Atlas of the British Isles 3: 1129 (1998).
On Ash (Fraxinus excelsior), Gleniffer Braes (Brownside Braes), Renfrewshire, May 2009
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Uploaded June 2009, replacing previous page (July 2008), last modified June 2010
