Lichenologist 46(4): 540 (2014).

Basionym: Lecidea filamentosa Stirt., Scott. Natural. 5: 218 (1879).

Type locality: Great Britain, Scotland, Glen Lochay, Killin, 21 July 1879, Stirton (GLAM-NHB.1927.8.01010 - lectotype [HPLC: atranorin, usnic acid, paraensic acid C, paraensic acid D]; BM 731241 - isolectotype [HPLC: atranorin, usnic acid, paraensic acid D]).

Chemistry: Atranorin, usnic acid, paraensic acid C, paraensic acid D sometimes lacking, ... (Palice et al. 2011: 2).

Ecology: On mostly decorticated branches of Picea abies (Hauck & Schmull 2005: 485).