Lichen islandicus Linnaeus var. tenuissimus Linnaeus, Species Plantarum 2: 1145. 1753 .

"Habitat frequens in sterilissimis collibus Sueciae." RCN: 8196.

Lectotype (Howe in Bull. Torrey Bot. Club 39: 201. 1912): Herb. Linn. No. 1273.100 (LINN) .

Current name: Coelocaulon aculeatum (Schreb.) Link ( Parmeliaceae).

Note: See review by Jørgensen & al. (in Bot. J. Linn. Soc. 115: 322, 377, f 39. 1994).