. Studies on the vegetation of the Transcaspian lowlands. Botany. - 207 — survives till the next vegetative period. The bark of the persistent part is bi-own. The leaves are 2—4 centimetres long, linear-lanceolate. They are grey with salt-excretions which take the form of small white spots over depressions at the bottom of which the secreting glands are found. The structure of these (fig. 46 B) is very similar to that of the glands figured by Volkens (tab. V) from R. hirtella. Volkens was of opinion that during the night the excreted salts absorbed water from the atmosphere (dew), which might
. Studies on the vegetation of the Transcaspian lowlands. Botany. - 207 — survives till the next vegetative period. The bark of the persistent part is bi-own. The leaves are 2—4 centimetres long, linear-lanceolate. They are grey with salt-excretions which take the form of small white spots over depressions at the bottom of which the secreting glands are found. The structure of these (fig. 46 B) is very similar to that of the glands figured by Volkens (tab. V) from R. hirtella. Volkens was of opinion that during the night the excreted salts absorbed water from the atmosphere (dew), which might then be absorbed by the. Fig. 46. Reaumuria oxiana. A and B parts of leaf in transverse section; in A sclerencliyma-cells are seen; B, a salt-gland. X 202. C, Surface section of palisade tissue, showing palisade-cells and sclerenchyma-cells intermingled. gland and thus be utilised by the plant. Marloth (1887 p. 321) denies this and states that it is impossible for the glands of the leaf to absorb water fi-om the surface without at the same time absorbing the salts. On the contrary the salt solution on the surface must absorb water from the gland, and according to Fitting this is what takes place (1. c. p. 267 note). And still more important, Fitting has arrived at the result that plants in the desert store salt. 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 Paulsen, Ove, 1874-1947; Second Danish Pamir expedition. Copenhagen, Gyldendalske Boghandel
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectbotany, bookyear1912
