. Fresh-water biology. Freshwater biology. 59 iSSt 56) With basal heterocysts. each sheath. . Two to several filaments enclosed in Desmonema Berkeley and Thwaites. Filaments sometimes slightly branched; heterocysts always basal. On stones, in brooks, and waterfalls. Fig. 61. Desmonema wrangelii Borzi. X 200. (After Borzi.) 60 (54) Filaments usually stout, bearing true branches; cells rounded, dis- posed generally in more than one row; heterocysts present. Family Stigonemaceae . 61 5i (62,63) Sheaths thick; firm SHgonema Agardh. Filaments free-floating or aggregated on the substratum to form le
. Fresh-water biology. Freshwater biology. 59 iSSt 56) With basal heterocysts. each sheath. . Two to several filaments enclosed in Desmonema Berkeley and Thwaites. Filaments sometimes slightly branched; heterocysts always basal. On stones, in brooks, and waterfalls. Fig. 61. Desmonema wrangelii Borzi. X 200. (After Borzi.) 60 (54) Filaments usually stout, bearing true branches; cells rounded, dis- posed generally in more than one row; heterocysts present. Family Stigonemaceae . 61 5i (62,63) Sheaths thick; firm SHgonema Agardh. Filaments free-floating or aggregated on the substratum to form lelt-like masses; filaments composed partly of two to several cell-rows, sometimes of a single row, enclosed in a thick, lamellose, yellow- ish or brownish sheath, which is often of irregular thickness. Hormogonia formed at the ends of the vegetative branches or in special short branches. Heterocysts commonly lateral, or less often intercalary. Vegetative cells rounded, frequently showing protoplasmic continuity. Growing generally on damp ot. Fio. 62, nenta a, Stigonema oceltatum Thuret; b, StigO' minutum Hassall. X 44°. (After West.) wet rocks or moss; sometimes 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
