The Botany of Iceland - 01.12.1945, Page 70

The Botany of Iceland - 01.12.1945, Page 70
412 STEINDÓR STEINDÖRSSON This formation has previously been described from Iceland by Helgi J ónsson under the name “Græsli” (grassy slopes), both from the southem part of the country and from Snæfellsnes (1900, p. 66; 1905, p. 36 ff.). However, in the “Græsli” described by J ó n s s o n there occur a number of species which are absent from the brekkur formation dealt with here. Thus J ó n s s o n records Anthoxanthum odoratum, Agrostis canina, and Nardus stricta among the dominant species of the Græsli, but they are either lacking or very rare in the brekkur vegetation of the highland. T h o r o d d s e n (1914, p. 335-336) mentions “Grass-slopes” as parts of the valllendi, which is quite justi- fiable. In my opinion the brekkur formation described here is an alpine form of the “Græsli” of earlier authors, but may be regarded as a type of the valllendi formation. That nevertheless I do not refer the brekkur vegetation directly to the valllendi is due to its peculiar situation. Similar formations are recorded from several places in the neigh- bouring countries. Kruuse (1912, pp. 246-248) describes the Græsli of East Greenland as follows (translated from the Danish) : “steep... sloping,... without any constant afflux of running water, with deep- lying ground-water and a thin permanent snow-covering in the winter... The grass slopes are found in similar places as the herb slopes. Actually it only depends on the more or less abundant water supply whether one or the other of these formations will occupy the space... The snow- covering of the “Græsli” is low, but constant throughout the winter; as a rule it does not exceed 20 cm...” As far as I can see, precisely the same conditions under which the brekkur formation is formed, as also its relation to the snow-patches, are described here. The “Græsli” as described by K r u u s e has likewise many species in common with the brekkur vegetation. Hanna Resvoll Holmsen (1914, p. 60) describes grass fields on the mountain slopes of Foldal Moun- tains in Norway which are very similar to the brekkur formation men- tioned here, merely somewhat richer in species. In my opinion, how- ever, the formation described by Resvoll Holmsen might in part be referred to the snow-patches, but in its species composition it bears great resemblance to Jónsson’s “Græsli”. This author agrees with K r u u s e that the “grass field requires a constant snow-covering in the winter” (translated from the Danish). I assume that this is the case with the brekkur vegetation also. From the Faroes Ostenfeld describes grassy slopes which correspond entirely to J ó n s s o n’s grassy slopes in southern Iceland. From the examples added it appears that the
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