. Fresh-water biology. Freshwater biology. Forming leathery or slimy gelatinous masses, at first spher- ical or oblong, later of varied form, solid or hollow, and attached or unattached; filaments contorted and curved in all directions; the gelatinous sheath sometimes sharply delimited, more often fused with the enveloping jelly. Cells globular, barrel-shaped, or cyUndrical; heterocysts intercalary, or (when yoimg) sometimes terminal; spores globular or oblong, formed in rows in varying number be- tween the heterocysts. Forming free-floating or attached masses, on damp ground, wet rocks, etc.
. Fresh-water biology. Freshwater biology. Forming leathery or slimy gelatinous masses, at first spher- ical or oblong, later of varied form, solid or hollow, and attached or unattached; filaments contorted and curved in all directions; the gelatinous sheath sometimes sharply delimited, more often fused with the enveloping jelly. Cells globular, barrel-shaped, or cyUndrical; heterocysts intercalary, or (when yoimg) sometimes terminal; spores globular or oblong, formed in rows in varying number be- tween the heterocysts. Forming free-floating or attached masses, on damp ground, wet rocks, etc. Fig. 53- Nostoc commune Vaucher. (Original.) <i, natural size; b, X 465. 47 (44) Filaments more or less straight, free-floating or forming a thin mucous stratum 48 48 (52) Heterocysts and spores intercalary 4g 49 (5°! 51) Filaments naked, or with a thin sheath; single, or aggregated into formless, flocculent masses; cells equal to or longer than their diameter Anabaena Bory. Filaments straight or drcinate, naked or enclosed in a thin sheath, free floating as single filaments or united to form a thin, slimy stratum; vegetative cells as long or somewhat longer than thick; heter- ocysts numerous and intercalary; spores variously disposed, borne singly or rarely in short diams. A. flos-aquae Br^b. and A. circinalis Rabenh. are frequently abundant in fresh-water Fig. 54- Anabaena fios-aquae Br£bissoQ. (Original.) 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 Ward, Henry Baldwin, 1865-1945; Whipple, George Chandler, 1866-1924. joint author. New York, John Wiley & sons, inc. ; [etc. ,etc. ]
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectfreshwa, bookyear1918
