. The essentials of botany. Botany. RED SEAWEEDS 209 the substance of the plant body. The plants are col- lected, washed and dried and so preserved for human food (blanc mange) and especially as a food for convalescents. The structure of Cal- lymenia is similar to that of Chondrus. 327. Among the very commonly col- lected Red Algae on either coast are speci- mens of Plocamium remarkable for the beauty of its color and the regularity of its branching. Laboratory Studies, (a) It is better for the student to study the living plants of this phylum at the seashore, but the beginner should not fail
. The essentials of botany. Botany. RED SEAWEEDS 209 the substance of the plant body. The plants are col- lected, washed and dried and so preserved for human food (blanc mange) and especially as a food for convalescents. The structure of Cal- lymenia is similar to that of Chondrus. 327. Among the very commonly col- lected Red Algae on either coast are speci- mens of Plocamium remarkable for the beauty of its color and the regularity of its branching. Laboratory Studies, (a) It is better for the student to study the living plants of this phylum at the seashore, but the beginner should not fail to make a study of such specimens as may be accessible. Specimens for the study of structure should be preserved in alcohol or formaUn, using sea-water instead of fresh water. However, much may be made out by the careful examination of dried specimens which may be obtained from dealers. Red Seaweeds may often be obtained "in the rough" which can be moistened and then pressed out and dried for study. Such material wiU often yield quite good specimens. Good mounted microscopic specimens may sometimes be ob- tained showing the structure of the plant as well as of the sexual and asexual reproductive organs. (6) Make careful microscopical examination of Poly- siphonia using alcoholic or formaUn material. Such mounts should be made in sea-water or a 3 per cent, salt solution to avoid the sweUing of the cell walls. In the course of the study the following should be noted: (i) the cellular structure of the plant body, (ii) the tetraspores, (iii) the antherids, (iv) the oogones (difficult to find), (v) the cystocarps with their spores (carpospores). The closely related Dasya may be substituted for Polysiphonia. (c) Study the tissue of Chondrus. (d) Dried specimens of some or all of the following genera, mounted on heavy white paper, or cardboard, should be available for macroscopic examination. Porphyra, Batrachospermum, CoraUina, Grinnellia, Nito- phyllum, Polysiphonia, Dasya
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