. The botany of Iceland. Botany -- Iceland. 576 A. HESSELBO dium and Fossombronia which were growing here, the thermometer showed as high a temperature as 34° on the surface of the ground. On a slightly damp flat which was covered with a low-growing, dense form of Climacium dendroides, the surface temperature of the ground was 43°. In the more low-lying tracts, where the ground was rather damp, or partially inundated with hot water, there had, in several places, developed a luxuriant vegetation of phanerogams and moss- es, which was, however, often much trodden down. Here, in the boggy parts,
. The botany of Iceland. Botany -- Iceland. 576 A. HESSELBO dium and Fossombronia which were growing here, the thermometer showed as high a temperature as 34° on the surface of the ground. On a slightly damp flat which was covered with a low-growing, dense form of Climacium dendroides, the surface temperature of the ground was 43°. In the more low-lying tracts, where the ground was rather damp, or partially inundated with hot water, there had, in several places, developed a luxuriant vegetation of phanerogams and moss- es, which was, however, often much trodden down. Here, in the boggy parts, grew a low vegetation of Carex-Viola palustris, greatly mixed with Bryophyta, of which the following species, which grew intermixed, were observed: Hypnam stramineum, H. sarmentosum, , Hylocomium squarrosum, Sphagnum cymbifolium, Ca- tharinea undulata, Calypogeia Trichomanis, Alicularia scalaris, Ha- plozia crenulata, Scapania irrigua, Aneura pinguis and an undeter- minable Pohlia. On damp clayey flats Archidium, Fossombronia Dumortieri, Haplozia cremilata and Alicularia scalaris formed low, dense mats in which Anthoceros punctatus occasionally occurred in small rosettes. Below Great Geysir, Hypnum chrysophyllum grew on a clayey flat inundated with tepid water. Laugarvatnshverir. By the shore of lake Laugarvatn, below the farm of the same name and along the water's edge, there is a row of springs containing boiling water saturated with sulphur- etted hydrogen. The surrounding ground which consists of black basalt gravel is, owing to its ex- posed situation, quite bare of Bryo- phyte vegetation; and of higher plants only a few specimens of Polygonum Persicaria were found. By the northernmost of the springs only, which is situated at some dis- tance from the lake shore, a warm, damp clayey flat was covered with a carpet of Sphagnum cymbifolium, S. Girgensohnii, Polytrichum com- mune, Hylocomium squarrosum, Hyp- Fig. 24. Bryiim sp. «, Older leaves deve- num stramineum
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Keywords: ., bookcentury1900, bookcollectionbiod, bookdecade1910, bookyear1918
