Nouv. Arch. Mus. Hist. Nat., Paris, 5 sér. 1: 160 (1909).
Basionym: Parmelia nodulosa Dufour, in Fries, Lich. eur. reform. (Lund): 185 (1831).
Chemistry: With or without norstictic acid.
Ecology: Terricolous in desert soils, löss, partly on gypsum. Young on Diploschistes species.
Distribution Type: A single locality on Hierro, Canary Islands. North America, Mediterranean. Data lacking.
Note: In many countries there is a norstictic acid variety "reagens" accepted.
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