British Fresh Water Algae Exclusive Of Desmidieae And Diatomaceae Text

Author : Mordecai Cubitt Cooke
Publisher : Rarebooksclub.com
ISBN 13 : 9781230014456
Total Pages : 130 pages
Book Rating : 4.0/5 (144 download)

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Download or read book British Fresh-Water Algae; Exclusive Desmidieae and Diatomaceae written by Mordecai Cubitt Cooke and published by Rarebooksclub.com. This book was released on 2013-09 with total page 130 pages. Available in PDF, EPUB and Kindle. Book excerpt: This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1884 edition. Excerpt: ...elongated and rounded, cell angular, subquaternate, in section of thallus rounded, chlorophyllose body occupying about half the cell. In salt or brackish water. Perhaps hardly claiming a place in this work, as it is more truly a marine species. Plate LI., fig. 8. Portion of a frond X 200. Fig. 9, 10, sections of frond X 200. Fig. 11, zoogonidia X 300. Fig. 12, germinating X 200, after Bornet. Monostroma bullosum. Wittr. Mon., p. 28, is the Tetraspora b-ullosa of this work, seep. 16, plate vi., fig. 1. FAMILY II. SPHZE ROPLEACEE. Threads simple, with terminal vegetation, very long, articulate, articulations cylindrical, by spurious septa multilocular. Chlorophyllose mass distributed in annular bands, which enclose from 3-7 starch vesicles. Propagation by oospores after sexual fecundation, very numerous in the cells, at first green, then red, enclosed in a stellate sporoderm. Characters the same as given above for the family, which consists but of one genus. The following is an abstract of a memoir on Sphwroplea amiulina, by Cohn (in the " Ann. des Sci. Nat.," 1856, p. 187), describing the process of fructification: --" The structure of the resting-spores is very singular. They are red spherical bodies, from one 120th to one 100th of a line in diameter, and formed of two hyaline membranes, the interior of which is intimately connected with its plastic contents, whilst the exterior is loose and elegantly plaited. These plaits or folds are so arranged that they meet at their two poles; often, however, they are very irregular in shape and direction, especially in the larger spores. " In germination the resting-spores undergo several modifications. They become granular and change to a dull brown red, and a more...