. Algæ. Vol. I. Myxophyceæ, Peridinieæ, Bacillarieæ, Chlorophyceæ, together with a brief summary of the occurrence and distribution of freshwat4er Algæ . A D Fig. 28. A, Lynybya major Menegh. B and C,L. terugineo-ccernlea (Kiitz.) Gom. D, Phor-midium molle (Kiitz.) Goin. E and F, (Menegh.) Gom. All x 460. Fig. 29. A, Oscillatoria limosa , O. irrigua Kiitz. C, 0. tennisAg. D, O. spleiidida Grev. E,0. acuminata Gom. All x 4GO. Fam. Oscillatoriaceae. A large family distinguished from the other families of thePsilonernftteas by the absence of heterocysts. The trichomes consist of cyli
. Algæ. Vol. I. Myxophyceæ, Peridinieæ, Bacillarieæ, Chlorophyceæ, together with a brief summary of the occurrence and distribution of freshwat4er Algæ . A D Fig. 28. A, Lynybya major Menegh. B and C,L. terugineo-ccernlea (Kiitz.) Gom. D, Phor-midium molle (Kiitz.) Goin. E and F, (Menegh.) Gom. All x 460. Fig. 29. A, Oscillatoria limosa , O. irrigua Kiitz. C, 0. tennisAg. D, O. spleiidida Grev. E,0. acuminata Gom. All x 4GO. Fam. Oscillatoriaceae. A large family distinguished from the other families of thePsilonernftteas by the absence of heterocysts. The trichomes consist of cylindrical or disc-shaped cells, often somewhat modified at the extremities, the apical cell being frequentlyconidal and not uncommonly provided with a thickened calyptra. The cells may be socompactly joined that the trichomes are exactly cylindrical, or there may be a slightconstriction between each pair of adjacent cells. In the genera Spirutina, Arthrospira(fig. 30), and in some species of Lyngbya (fig. 19 F—H) the filaments are twisted intoa regular spiral, In certain genera, such as Microcolcus and Schizothrix (fig. 3), severaltrichomes are in
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