Images of British Lichens
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.
|On coastal wall, Bettyhill, West Sutherland, August 2006|
|On moorland rocks, Gleann Leireag, West Sutherland, August 2010|
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Uploaded April 2008, last updated December 2013