Chasmophytic vegetation of crevices and on ledges of siliceous rocks of Scandinavia, the Arctic Ocean archipelagos and Greenland
Saxifragion cotyledonis Nordhagen ex Mucina et Chytrý in Mucina et al. 2016
Saxifragion cotyledonis Nordhagen ex Mucina et Chytrý in Mucina et al. 2016
asp20 | The Saxifragion cotyledonis subarticum (Nordhagen 1937; see also Nordhagen 1943) contained only sociations in the protologue. The Saxifragion cotyledonis remained invalidly published until Dierssen (1982: 193) described the Rhodiolo roseae-Saxifragetum cotyledonis, and assigned one of the relevés published by Nordhagen (1943: Tab. 98, rel. 6) as ‘lectotypus’ (recte: holotypus) of his new association. Yet Dierssen (1982) has not recognised the Saxifragion cotyledonis as an alliance in its own right. Instead, he assigned the Rhodiolo roseae-Saxifragetum cotyledonis to the Androsacion vandelii. We suggest that the latter alliance (typical of siliceous crevices of the mountains of the nemoral zone) has floristically not much in common with the Saxifragion cotyledonis (typical for the boreal to subarctic zones). Here we assign the Rhodiolo roseae-Saxifragetum cotyledonis Dierssen 1982 as the holotypus (hoc loco) of the Saxifragion cotyledonis. The diagnostic species of the validated alliance are: Saxifraga cotyledon, S. nivalis and Woodsia alpina. (L. Mucina, M. Chytrý).