Images of British Lichens
Rhizocarpon oederi (Weber) Körb.
Thallus a rust-coloured, cracked-areolate crust; apothecia small (c. 0.5 mm diameter), clustered, black, initially concave but disc becoming domed, with minute, raised folds (gyrose). Locally frequent in the north and west, on base-poor but iron-rich rocks.
Refs: Smith et al. (2009), 803; Purvis et al. (1992), 539; Dobson (2005), 388 (photo); Dobson (2011), 392 (photo); Jahns (1983), 208-9 (photo); Wirth (1995), 2: 805, 815 (photo); Wirth, Hauck & Schulz (2013), 2: 986, 995 (photo).
|On metalliferous, upland rockface, Langdon Common, Co. Durham, June 2009|
|Intermixed with Tremolecia atrata (slightly lighter-coloured areoles with smaller, concave, immersed apothecia),|
on metalliferous rock in montane block scree, Braemar, Aberdeenshire, March 2008
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Uploaded June 2009, last updated September 2013