In addition to the usual, wind-exposed habitats of communities dominated by Trailing Azalea (Loiseleuria procumbens), this paper presents hitherto unknown habitats of Loiseleuria procumbens and Betula nana community (Betulo nanae-Loisleurietum procumbentis Franz 2004). The former, Gymnomitrio concinnati - Loiseleurietum procumbentis Grabherr 1993, is characterized by significant sickle-shaped, incipient erosion cracks and by open areas poor in vegetation and paved with small stones due to the influence of needle ice, deflation, and thin snowcover. Snow free periods caused by wind exposure in winters can be followed by rare snowfall in springs and autumns which in turn causes needle ice. The latter grows on snow-covered slopes. Both Loiseleurio-Cetrarietum, which occasionally can be sighted on snow-covered slopes, and the newly described Betulo nanae-Loiseleurietum procumbentis Franz 2004 can be found on hummocks (icel. Thufur), with considerably longer snow cover, higher soil wetness and a thick humus layer being the main determinators for their original growth. Betulo nanae-Loiseleurietum procumbentis, is a relic-community, which mainly can be found on nunatakks in the Nockberge (Carinthia and Styria). 1,5 releves of this assoziation are presented in this paper. Key words: Loiseleuria procumbens, Betula nana, dwarf shrub communities, frozen soils, hummocks, Nockberge, Carinthia, Austria.