Desmids of the United States and List of American Pediastrums with Eleven Hundred Illustrations on Fifty-Three Colored Plates (Paperback)

This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated.1884 Excerpt: ... Specimens occur frequently in pools and ponds all over the country, rarely unmingled with other forms. It is readily distinguished by its large size, deep incisions of the border, and twisted outline. D. Quadratum, Nord. Plate XLIX, fig. 5. Differs from the preceding in the cells being nearly as long as broad, and viewed from the side, quadrate. The breadth of the cells is only about one-fifth more than the length; the thickness, the same as the length. Chlorophyl mass in each cell in end view, more or less radiate. Diameter 45 /.; length, 33-38 ft.; thickness, 33-38 //. Found this form repeatedly during the past four years, but rarely, except in ponds, Brown's Mills, New Jersey. It varies in size from the Norway typical plant', in being considerably larger; otherwise it appears to be identical. D. Longatum, Wolle. Plate XLIX, fig. 6. Filaments thin; cells in front view nearly twice as long as wide; in side view nearly 2A times longer than broad; closely united without a thickened border at their junction; end view broadly elliptic. Diameter, widest part, 28/(.; thickness, Hi-lS //.; length of cell, 35-40 ft. This interesting new species from Brown's Mills, New Jersey, was found late in the season (September 22, 1883); no gelatinous sheath was observable; the filaments were hyaline except two chlorophyl nuclei in each cell. D. Swartzii, Ag. Plate II, figs. 1-b." Filament triangular, with a single longitudinal, waved, dark line, formed by the third angle, (compare figs. 6, 8, 13); joints in front view somewhat quadrangular, broader than long, with two slightly angular erenatures on each lateral margin, united at the whole of their end margins by a thickened border; end view triangular with the chlorophyl three-rayed. Zygospores oval. Diameter 36 //.., more or...