Lepraria gelida Tønsberg & Zhurb.
Nomenclatural data
Graphis Scripta, 18: 64 (2006)
Morphology
Crustose, leprose, powdery-cottony to slightly granular; white, cream or light creamy grey, sometimes with rose tinge (herbarium specimens), only very rarely with bluish (“cold”) tinge; not very firmly attached to the substrate; usually growing in irregular patches 1–3(-4) cm, rarely up to 10 cm in diam., sometimes young thalli form rosettes up to 1 cm in diameter; usually thick and relatively soft, soredia in cushions, rarely thin and soredia sparsely and evenly distributed; variably sized leprose surfaces without or with only sparse individual soredia present, sometimes relatively large, giving the thallus a cottony-woolly appearance; thallus margin diffuse or delimited and rarely obscurely sublobed; medulla distinct, white, rarely thin and not evident; soredia variably sized, relatively loosely composed, mostly 65–100 µm, occasionally few up to 200 µm in diam., with short to medium projecting hyphae.
Chemistry
Only one chemotype occurs, with alectorialic and porphyrilic acids (n = 46).
Remarks
Two morphotypes were recognizable in most of the material – a common one which is creamy, softer, more cottony, with evident medulla and smaller soredia with distinct projecting hyphae (Fig. 5); and a rare type which is greyish white, mostly with bluish („cold“) tinge, with more granular appearance, thin and not evident medulla, slightly larger soredia and very short and scarcely projecting hyphae on the soredia. The latter, granular type is still quite distinct from the L. neglecta group.
L. gelida was recently described as new by Tønsberg & Zhurbenko (2006) briefly and the description provided here above is more detailed.
Ecology and distribution

Greenland
On soil and bryophytes, sometimes overgrowing other lichens, rarely on bark of low shrubs.
L. gelida is reported as new to Greenland. It is rather evenly distributed along the coast both in the Low and High Arctic zones (Fig. 4C). Its world distribution was earlier known to comprise Svalbard and the Russian arctic islands near the Taimyr peninsula (Tønsberg & Zhurbenko 2006).
Literature
Saag, L., Hansen, E. S., Saag, A. & Randlane, T. 2007.
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