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Physcia aipolia (Ehrh. ex Humb.) Fürnr.


Foliose, lobes without marginal cilia, lobe surfaces with distinct white flecks (pseudocyphellae), soralia absent, both cortex and medulla reacting yellow with potassium hydroxide; apothecia with brown to black, thinly pruinose discs. Widespread and locally common on twigs and bark. P. stellaris is very similar but more or less lacks pseudocyphellae on the lobe surfaces, and while the cortex reacts yellow with potassium hydroxide, its medulla is non-reactive.

Refs: Smith et al. (2009), 700; Purvis et al. (1992), 468; Dobson (2005), 338 (photo); Dobson (2011), 339 (photo); Jahns (1983), 250-251 (photo, printed with incorrect colour in my copy); Whelan (2011), 130 (photo); Nordic Lichen Flora (2002) 2: 34, 97 (photo, var. aipolia); van Haluwyn et al. (2009), 42-3 (photo); van Herk & Aptroot (2004, 2013), 296-7 (photo); Wirth (1995), 2: 726, 728 (photo); Wirth et al. (2004), 117 (photo); Frahm et al. (2010), 132 (photo), 133; Moberg & Holmåson (1984), 200 (photo); Holien & Tønsberg (2008), 78 (photo); Stenroos et al. (2011) 352-3 (photo); Valcárcel et al. (2003), 306-7 (photo);Brodo et al. (2001), 549-50 (photo); Hinds & Hinds (2007), 391 (photo); Walewski (2007), 122 (photo, as P. stellaris); Lichen Atlas of the British Isles 3: 1113 (1998).

Lichenicolous fungi on this host include Marchandiomyces corallinus and Syzygospora physciacearum.

 
Physcia aipolia
Taymouth, Perthshire, April 2002. Note that lobes of Parmelia sulcata can be seen growing through the Physcia aipolia colony.
 
Physcia aipolia
Kindrogan, Perthshire, March 2008
 
Physcia aipolia, close-up of apothecia
Saltash, Cornwall, August 2008


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© A.J. Silverside
Uploaded June 2008, last updated December 2013 (first hosted at www-biol.paisley.ac.uk, January 2003)