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Tremolecia atrata (Ach.) Hertel
Thallus a yellowish-rust to rust-coloured, cracked-areolate crust; apothecia small (c. 0.5 mm diameter), black, concave, sunken in the thallus. Locally common in the north and west, on base-poor but iron-rich rocks.
Refs: Smith et al. (2009), 911; Purvis et al. (1992), 615; Dobson (2005), 434 (photo); Moberg & Holmåson (1984), 128 (photo); Holien & Tønsberg (2008), 191 (photo); Wirth (1995), 2: 927 (photo); Hansen & Anderson (1995), 117 (photo); Pope (2005), 56 (photo); Thomson (1997), 626-8 (photo); Brodo et al. (2001), 688 (photo).
Intermixed with Rhizocarpon oederi (more deeply rust-coloured areoles with eventually domed apothecia),
on metalliferous rock in montane block scree, Braemar, Aberdeenshire, March 2008
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Uploaded June 2009, last modified June 2010