. Algæ. Vol. I. Myxophyceæ, Peridinieæ, Bacillarieæ, Chlorophyceæ, together with a brief summary of the occurrence and distribution of freshwat4er Algæ . and B, Stigonema miinitniii Hass. ; A, xlOO; J5, x 440. C — E, St. ocellatum(Dillw.) Thur. ; C, xlOO; D and A, x 400. /;, Fig. 35. J and B, p«rictina (Nag.) Tlinr. C, interrapta W. &G. S. West. D, D. Orsiniana (Kiitz.) Born. & Flah. All x 420. gelatinous and sometimes incrusted with lime. In Gloeotrichia, which occurs largely inthe plankton, the gelatinous mass is usually free-floating. The genus scarcely d
. Algæ. Vol. I. Myxophyceæ, Peridinieæ, Bacillarieæ, Chlorophyceæ, together with a brief summary of the occurrence and distribution of freshwat4er Algæ . and B, Stigonema miinitniii Hass. ; A, xlOO; J5, x 440. C — E, St. ocellatum(Dillw.) Thur. ; C, xlOO; D and A, x 400. /;, Fig. 35. J and B, p«rictina (Nag.) Tlinr. C, interrapta W. &G. S. West. D, D. Orsiniana (Kiitz.) Born. & Flah. All x 420. gelatinous and sometimes incrusted with lime. In Gloeotrichia, which occurs largely inthe plankton, the gelatinous mass is usually free-floating. The genus scarcely differs fromRivularia, except in the formation of large cylindrical resting-spores. In Homceothrixand two other genera there are no heterocysts. 46 Myxophycex Fam. Camptotrichaceae. This family was established in 1897 (W. & G. S. W. 97A and B) to include certain Blue-green Algae which differ from members of the Rivulari-acefe in the attenuation of the filaments from the middle towards each end. The plantsare epiphytes and there are no heterocysts. Camptotkrix is a genus of small tropicalepiphytes in which the filaments terminate in blunt extremities, whereas Hammatoideaincludes larger and more elongate filaments with piliferous apices. LITERATURE CITED BORZI, A. (78).
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