Lepraria nivalis J.R. Laundon
Nomenclatural data
Lichenologist 24: 327 (1992)
Crocynia murorum de Lesd., Bull. Soc. Bot. France 95:199 (1948)
Morphology
Material from Greenland is leprose, cottony, soft, usually thick; white to light grey, usually with bluish (“cold”) tinge; thallus margin delimited, with obscure sublobes or diffuse; medulla present, white; soredia loosely packed, variably sized, sometimes coarse, usually with projecting hyphae usually present.
Chemistry
Like in L. caesioalba, several chemotypes have been distinguished in L. nivalis (Laundon 1992, Leuckert et al. 1995, 2004). All Greenland specimens contained atranorin and the stictic acid complex, in two of them additionally rangiformic acid was detected.
Remarks
L. nivalis is very heterogeneous both chemically and morphologically, possibly including different taxa (Baruffo et al. 2006, Crespo et al. 2006). Related taxa include L. crassissima (Hue) Lettau and L. isidiata (Llimona) Llimona & A.Crespo (Crespo et al. 2006). L. crassissima has a distinctive chemistry containing divaricatic and nordivaricatic acids; L. isidiata has a unique morphology – isidia and a very thick, lobed thallus.
L. nivalis is distributed in Europe, North America and Asia, the stictic acid chemotypes being most common in Mediterranean Europe and Macaronesia (Baruffo et al. 2006, Leuckert et al. 1995, 2004). The Greenland localities are the northernmost so far. Two specimens assigned to L. nivalis contained rangiformic acid, the fatty acid which has not been reported from this species before. It is possible that the Greenland specimens represent another undescribed taxon but more collections and investigation are needed to establish that. Hereby we report these specimens as tentatively assigned to L. nivalis.
Ecology and distribution

Greenland
On soil and mosses.
Reported as new to Greenland from four scattered localities.
Literature
Saag, L., Hansen, E. S., Saag, A. & Randlane, T. 2007.
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