Lepraria alpina (de Lesd.) Tretiach & Baruffo var. alpina
Nomenclatural data
Lepraria alpina (de Lesd.) Tretiach & Baruffo, Nova Hedwigia 83: 395 (2006), var. alpina
Crocynia alpina de Lesd., Bull. Soc. Bot. France 61: 85 (1914)
Leproloma cacuminum sensu J.R. Laundon, The Lichenologist 24: 345 (1992); Leproloma angardianum (Øvstedal) J.R. Laundon, The Lichenologist 21(1): 19 (1989); Lepraria angardiana Øvstedal, Nova Hedwigia 37: 687 (1983); Lepraria caerulescens (Hue) Botnen & Øvstedal, Polar Research 6: 130 (1988); Lepraria cacuminum sensu Loht., Ann. Bot. Fennici 32: 52 (1995); non Diploicia cacuminum A. Massal., Symm. Lich. Nov.: 52 (1855)
As typical in the L. neglecta group, coarsely granular, hard, rarely softer and of looser consistence. See detailed description under L. alpina var. zeorinica.
Five chemotypes occur in Greenland: (1) with atranorin, porphyrilic and roccellic/angardianic acids (n = 60); (2) with atranorin, porphyrilic and rangiformic acid (n = 6); (3) with atranorin and porphyrilic acid without fatty acids (n = 7); (4) with porphyrilic and roccellic/angardianic acids without atranorin (n = 2); (5) with porphyrilic acid only (n = 10).
This species was known under the name Lepraria cacuminum (A. Massal.) Loht. until very recently, when Baruffo et al. (2006) found the lost type material of Diploicia cacuminum, the basionym for Lepraria cacuminum (Laundon 1992), and proved that it belonged to quite another lichen, Buellia insignis (Hepp) Th. Fr. The new combination Lepraria alpina (based on Crocynia alpina) was proposed and a neotype selected.
L. alpina is morphologically very similar to L. caesioalba, although often a little softer and with looser overall appearance. Both these taxa belong to the L. neglecta group, thallus of which is characterized by coarsely granular and hard soredia. A further species, L. atlantica, was separated from L. alpina by Orange (2001) on the basis of a powdery or almost cottony thallus constitution. Its distinctiveness has also been shown by DNA studies (Ekman & Tønsberg 2002, Slavíková-Bayerová & Fehrer 2007). Several thalli studied by us were intermediate between these two species; more granular specimens were assigned to L. alpina, more powdery ones to L. atlantica. Previously only a few intermediate specimens were known and the two species were considered to be morphologically strictly distinct (Orange 2001, Baruffo et al. 2006). We can report almost a continuum in morphology of the two taxa in Greenland.
Ecology and distribution

On soil and bryophytes, sometimes overgrowing other lichens, rarely on rocks.
L. alpina var. alpina is abundant across the Low Arctic in Greenland but scarce in the High Arctic and totally absent from the north coast. Only a few localities have been reported earlier (Leuckert & Kümmerling 1991).
Saag, L., Hansen, E. S., Saag, A. & Randlane, T. 2007.