. The botany of Iceland. Botany -- Iceland. PHYSICAL GEOGRAPHY 333 sected with clefts, rent by frost, which are filled with- Grimmias and Salijc herbacea. The flora of the lava-streams cannot be referred to any single plant-formation, because according to the age and the progessive development of the vegetation, the lava may bear on it all possible kinds of plant-formations. Nevertheless in Iceland several plants. Fig. 33. Lava-field in Nordrardal in the district of Borgarfjord (Aug. 3, 1909). The lava is covered to a depth of one foot with a layer of Grimmia hypnoides. Projecting parts of the
. The botany of Iceland. Botany -- Iceland. PHYSICAL GEOGRAPHY 333 sected with clefts, rent by frost, which are filled with- Grimmias and Salijc herbacea. The flora of the lava-streams cannot be referred to any single plant-formation, because according to the age and the progessive development of the vegetation, the lava may bear on it all possible kinds of plant-formations. Nevertheless in Iceland several plants. Fig. 33. Lava-field in Nordrardal in the district of Borgarfjord (Aug. 3, 1909). The lava is covered to a depth of one foot with a layer of Grimmia hypnoides. Projecting parts of the lava are covered with crustaceous lichens. Here and there a tuft of Festnca ovina. Birch coppice in the background. (Phot. A. Hesselbo.) are more particularly associated with lava-streams and have there found shelter in the numerous clefts and depressions, where condi- tions of life are especially suitable for them. Paris qimdrifolia is found only on lava-streams, and also ferns are found, in abundance and often as very large specimens. Aspidinm filiv mas, A. spinnlo- sum, and A. phegopteris very rarely occur in other habi- tats than lava-clefts; Athyrium filix femina, Woodsia ilvensis 9 Poly- podium vulgare, Aspidinm dryopteris and Cystopteris fragilis are also common in lava-clefts, although they are also met with fairly often in other localities, between blocks of rock and in rock-clefts. Milinm effiisum occurs also most frequently in lava-clefts. On lava- 22*. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Kolderup Rosenvinge, L. (Lauritz), 1858-1939; Warming, Eugenius, 1841-1924. Copenhagen, J. Frimodt
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Keywords: ., bookcentury1900, bookcollectionbiod, bookdecade1910, bookyear1912
