Parmeliella triptophylla (images of British lichens)

Thallus consisting of small, brown to blue-grey squamules, about 1mm in width, patchily developed on a black prothallus, interspersed with somewhat larger, flattened lobules, squamule margins beset with finger-like or branched isidia, which may develop more completely across the thallus surface; apothecia red-brown, uncommon. A local species of mossy bark and boulders in sheltered, humid, old woodland in northern and western Britain. Dobson (2005) uses a lack of a strong antiseptic smell when crushed as a key feature to separate this species from the similar P. testacea, but James & Purvis, in Smith et al. (2009), describe this smell for both species and the character is not mentioned for either species by Jørgensen in Nordic Lichen Flora (2007). The photographed material was not smelled.

Refs: Smith et al. (2009), 656; Purvis et al. (1992), 438; Dobson (2005), 305 (photo); Dobson (2011), 307 (photo); Nordic Lichen Flora (2007) 3: 108, 191 & 192 (photos); Moberg & Holmåson (1984), 167 (photo); Holien & Tønsberg (2008), 110 (photo); Arup et al. (1997), 228 (photo); Hansen & Anderson (1995), 105 (photo); Hinds & Hinds (2007), 341 (photos); Brodo et al. (2001), 485 (photo); Lichen Atlas of the British Isles 4: 1032 (1999).

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Images of British Lichens