Lepraria borealis Loht. & Tønsberg
Nomenclatural data
Ann. Bot. Fennici 31: 224 (1994)
Coarsely granular, hard, sometimes somewhat softer and of looser consistence, but never with small soredia or near-cottony composition; thallus margin diffuse or often delimited and with obscure sublobes or rim. Usually closely resembles L. caesioalba, as both taxa belong to the L. neglecta group.
Two main chemotypes are recorded in Greenland: (1) with atranorin and roccellic/angardianic acids (n = 23); (2) with atranorin and rangiformic acid (n = 18); and additionally, (3) with both fatty acids, besides atranorin (n=3); (4) with atranorin only, lacking any fatty acids (n = 8); (5) with roccellic/angardianic acid only, lacking atranorin (n = 4).
Specimens of L. borealis lacking rangiformic acid were also reported by Kukwa (2006b). Specimens with atranorin only or fatty acids only were tentatively placed in this taxon by us; they can alternatively be considered deficient representatives of L. alpina as there are no distinctive morphological differences between these two species (Prigodina-Lukošienë et al. 2003, Kukwa 2006b; see also Lohtander 1995).
Ecology and distribution

On soil and bryophytes, sometimes overgrowing other lichens, sometimes on rocks.
Reported here as new to Greenland. Like other members of the L. neglecta group, L. borealis is rather widely distributed in Greenland, most frequently found in the Low Arctic.
Saag, L., Hansen, E. S., Saag, A. & Randlane, T. 2007.