. Elementary botany. Botany. 3«4 ECOLOG Y. crops (sedum), or small thick leaves which are closely overlapped as in the Saxifraga oppositifolia. 693. Few of us, unfortunately, can make the trip to the arctic regions to study these interesting plants which play such an im- portant role in the economy of nature. Rocky places, however,. Kig. 4S3. Rock lichen (umbilicaria) from Greenland. or loose stones are common nearer home. Observation of their flora, and the means by which such plants derive nutriment, store moisture, or protect themselves from drought, will well repay out- door excursions. 69
. Elementary botany. Botany. 3«4 ECOLOG Y. crops (sedum), or small thick leaves which are closely overlapped as in the Saxifraga oppositifolia. 693. Few of us, unfortunately, can make the trip to the arctic regions to study these interesting plants which play such an im- portant role in the economy of nature. Rocky places, however,. Kig. 4S3. Rock lichen (umbilicaria) from Greenland. or loose stones are common nearer home. Observation of their flora, and the means by which such plants derive nutriment, store moisture, or protect themselves from drought, will well repay out- door excursions. 694. Filling of ponds by plants.—Not only are plants im- portant agencies in the formation of soil in rocky regions, they. 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 Atkinson, George Francis, 1854-1918. New York, H. Holt
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