Thomson J.W.
(1967):
Notes on Rhizocarpon in the arctic.,
Nova Hedwigia,
14: 321-481
Rhizocarpon alaxensis sp. nov., R. cummulatum sp. nov., R. sect. Superficiale (Runem.) stat. nov., sect. Alpicola (Runem.) stat. nov., sect. Viridiatrum (Runem.) stat. nov., subgen. Phaeothallus subgen. nov., sect. Rittokense sect. nov., sect. Albothallus sect. nov., sect. Fuscothallus sect. nov., R. riparium subsp. lindsayanum (Ras.) comb. nov.
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