. Algæ. Vol. I. Myxophyceæ, Peridinieæ, Bacillarieæ, Chlorophyceæ, together with a brief summary of the occurrence and distribution of freshwat4er Algæ . cludes the Chtetocerese, Biddulphiete, Anaulese, andEuodiese. d. Rutilarioidese. Cells boat-shaped, with an irregular or radiating the Rutilarieae. B. Pennatse. Valves zygomorphic, or less frequently irregular, never centric; mostly boat-shaped or needle-shaped, with a structure arranged in relation to a raphe or pseudoraphe. Fragilarioidese. Cells mostly straight, rod-shaped or lanceolate, without a raphe,but sometimes wit
. Algæ. Vol. I. Myxophyceæ, Peridinieæ, Bacillarieæ, Chlorophyceæ, together with a brief summary of the occurrence and distribution of freshwat4er Algæ . cludes the Chtetocerese, Biddulphiete, Anaulese, andEuodiese. d. Rutilarioidese. Cells boat-shaped, with an irregular or radiating the Rutilarieae. B. Pennatse. Valves zygomorphic, or less frequently irregular, never centric; mostly boat-shaped or needle-shaped, with a structure arranged in relation to a raphe or pseudoraphe. Fragilarioidese. Cells mostly straight, rod-shaped or lanceolate, without a raphe,but sometimes with a pseudoraphe or with indications of the commencement ofa raphe. Includes the Tabellarieee, Meridionepe, and Cells crooked or suddenly bent, with a raphe on one valve and apseudoraphe on the other. Includes the Achnanthese and the Cocconeideee. Naviculoidefe. Cells with a raphe on each valve, with or without a keel in theline of the raphe (sagittal line). Includes the Naviculese and Nitzschieee. Surirelloide&. Cells with the raphe concealed in submarginal wings of eachvalve. Includes only the Surirelleoe. e. f.
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