The Botany of Iceland - 01.12.1945, Side 111

The Botany of Iceland - 01.12.1945, Side 111
THE VEGETATION OF CENTRAL ICELAND 453 Icelandic Grimmia heath have a particularly large number of phanero- gamous species in common. (Table XVII-XVIII A-B). I have not been capable of distinguishing more than two associa- tions within the Grimmia heath; I assume, however, that more associa- tions would be found if it were subjected to a more accurate investiga- tion. i. Salix herbacea—Polygonum viviparum-Ass. (Tab. XVII. A-B, 1-4, 6; XVIII, A-B, 5-6). Salix herbacea and Polygonum viviparum are the dominant species everywhere in this association, but in addition to these, other dominants have bcen found in a few analyses. Thus Festuca rubra is very common in XVII, 1-3, F. ovina in XVII, 4, Poa alpina in XVII, 1-2, and Elyna Bellardi in XVII, 4. Hence these four analyses may be said to represent a grassy variant of the association, but none of these species are present in such great numbers that they might be termed character species of the association. Analyses XVII, 1-3 were taken in the afore- mentioned mountain near Hvannalindir, where the Grimmia heath is mostly found as rather small cushions on the mountain sides at an altitude of 850-950 m. The mountain sides are very steep, but I noticed no difference in the formation owing to difference in exposure. These analyses show the lowest number of species and the lowest geophyte percentage of the Grimmia heath, while the H percentage is relatively high. Analysis XVII, 4 is from the mountain Loðmundur, altitude 970 m, from the mountain plateau proper, where the Grimmia heath forms a rather extensive growth. The H percentage is much lower here than in the preceding analyses. Analysis XVII, 6 was taken on the moun- tain Kýlingur at an altitude of c. 790 m. Only few gramineous plants were found in this locality, whereas chamaephytes dominate, and Rho- diola rosea is likewise very conspicuous physiognomically in spite of its low degree of covering. The analysis was taken in a locality situated between the localities of analyses XVII, 5 and 7. Here the terrain is highest and most exposed to the wind, and the snow-covering is, no doubt, thinnest. Analyses XVIII, 5-6 are both from Síðumannaafrjet- tur. The A percentage is somewhat lower here than in the other analyses, but otherwise there is nothing particularly noteworthy; both analyses were made in a slopíng terrain, analysis 5 in the mountain
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The Botany of Iceland

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