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Parmelia omphalodes (L.) Ach.


Thallus foliose, yellowish brown to dark brown, grey- or green-tinted when shaded or wet, with conspicuous, white pseudocyphellae on the lobe surfaces; medulla orange-red with potassium hydroxide; apothecia with dark-brown discs and pale, crenulate margins. Locally common in the north and west, on exposed, base-poor rocks.

Refs: Smith et al. (2009), 652; Purvis et al. (1992), 425; Dobson (2005), 302 (photo); Dobson (2011), 304 (photo); Jahns (1983), 196-7 (photo); Allen (2007), 24 (photo); Whelan (2011), 121 (photo); van Herk & Aptroot (2004, 2013), 276-277 (photo); Hansen & Anderson (1995), 45 (photo); Moberg & Holmåson (1984), 91 (photo); Holien & Tønsberg (2008), 56 (photo); Nordic Lichen Flora (2011) 4: 85, 162 (photo, as P. omphalodes subsp. omphalodes); Stenroos et al. (2011), 303 (photo, as P. omphalodes subsp. omphalodes); Wirth, Hauck & Schulz (2013), 2: 806, 809 (photo); Valcárcel et al. (2003), 272-3 (photo); Puntillo (1996), plate 28 (photo); Brodo et al. (2001), 482 (photo); Hinds & Hinds (2007), 337-8 (photo); Lichen Atlas of the British Isles 1: 1006 (1995).

Can be confused with P. discordans (q.v.) and best confirmed by chemical tests (medulla K- in P. discordans, but cortex K+ yellow in both species); beware also of old and brown states of P. sulcata and P. saxatilis (latter strongly isidiate).

Lichenicolous fungi on P. omphalodes include Nesolechia oxyspora.

Parmelia omphalodes on drystone wall
On coastal wall, Bettyhill, West Sutherland, August 2006
 
Parmelia omphalodes on drystone wall
On moorland rocks, Gleann Leireag, West Sutherland, August 2010


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Uploaded April 2008, last updated December 2013