. The algae. Algae. FRESH WATER ECOLOGY; SOIL ALGAE 365 Phase Autumn Winter Early spring Late spring Summer Dominants Closterium, Englena, Oedogonium Spirogyra spp. Spirogyra sp. Spirogyra, Euglena, Oedogonium No one species In another pond somewhat different phases were recorded: Phase Dominants Autumn Oedogonium, Chaetophora Winter Vaucheria Late spring Oedogonium, Pleurococcus Summer Chaetophora These observations should be compared with those from the Harpenden pool, and it will be seen that although the spring phases are essentially similar with either Spirogyra or Oedogonium, never- thel
. The algae. Algae. FRESH WATER ECOLOGY; SOIL ALGAE 365 Phase Autumn Winter Early spring Late spring Summer Dominants Closterium, Englena, Oedogonium Spirogyra spp. Spirogyra sp. Spirogyra, Euglena, Oedogonium No one species In another pond somewhat different phases were recorded: Phase Dominants Autumn Oedogonium, Chaetophora Winter Vaucheria Late spring Oedogonium, Pleurococcus Summer Chaetophora These observations should be compared with those from the Harpenden pool, and it will be seen that although the spring phases are essentially similar with either Spirogyra or Oedogonium, never- theless there are great differences. The two ponds described above also possessed floras that were essentially different and they must therefore be regarded as containing two separate associations. Furthermore, the same worker found that a sudden change in the external conditions checked the growth of an alga and often re- sulted in the development of a resting stage or else of sexual organs; 1906 SEPT. OCT. NOV. DEC. JAN. FEB. MAR. APR. JMAY JUNE \}^^^^^- 20 "^Ts 9~7r TT? T 17 I H I 15 3 15 I 14 I 13 I 15 I VERY ABUND. ABUND. RATHER ABUND. RATHER RARE RARE VERY RARE Q-' Water Z h" Air T—I—I—r-]—I—r—1—I—I—r OEDOGONIUM CRYPTOPORUM. T—I—I—I—I—r—I—r—1—I—r /•'"?-N, SPIROGYRA / ^'^.JSIITIDA \ EUGLENA SPIROGYRA/ VARIANS / it f* _J I I—L. 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 Chapman, V. J. (Valentine Jackson), 1910-. London, Macmillan; New York, St. Martin's Press
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Keywords: ., bo, bookcentury1900, bookcollectionbiodiversity, booksubjectalgae
