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Sticta fuliginosa (Hoffm.) Ach.


Mature thallus of grouped, rounded,often single lobes, grey to grey-brown, surface abundantly isidiate when mature, the isidia becoming smoky-brown, margins not sorediate, under-surface brownish-tomentose, with scattered, white or pale cyphellae (breaks in the lower cortex); apothecia rare, said to be red-brown with crenate or minutely hairy margins. On mossy trees and rocks, mostly in the west and generally in old, humid forest. Compare S. sylvatica.

Refs: Smith et al. (2009), 866; Purvis et al. (1992), 583; Dobson (2005), 419 (photo); Dobson (2011), 424 (photo); Jahns (1983), 244-5 (photo); Whelan (2011), 143 (photo); van Haluwyn et al. (2009), 54-5 (photos); Valcárcel et al. (2003), 354-5 (photo); Wirth (1995), 2: 884-5 (photo, wet); Holien & Tønsberg (2008), 117 (photo); Nordic Lichen Flora (2007) 3: 85, 207 (photo); Thor & Arvidsson (1999), 328 (photo, underside, showing cyphellae), 492; Brodo et al. (2001), 672, 673 (photo); Hinds & Hinds (2007), 467 (photo); McCune & Geiser (2009), 327 (photo); Walewski (2007), 127 (photo); Lichen Atlas of the British Isles 3: 1367 (1998).

In American books, called the "Peppered Moon Lichen". I rather like that.

Sticta fuliginosa
Sticta fuliginosa
Sticta fuliginosa, close view
On humid rocks, near Port Mòr, Isle of Muck, July 2012 (BLS meeting)
 
Sticta fuliginosa
On Sycamore (Acer pseudoplatanus), near Port Mòr, Isle of Muck, July 2012 (BLS meeting)


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Uploaded October 2013