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. 1904 Excerpt: ...takes place by division of the cells in two directions. Fig. 72. Polychatophora lamellosa West & G. S. West, from Cirencester, Gloucestershire (x 370). P. lamellosa West & G. S. West is the only species of the genus and has been found in Gloucestershire amongst Tolypothrix pygmcea. Diam. of cells 19--35 p; thickness of ...
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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. 1904 Excerpt: ...takes place by division of the cells in two directions. Fig. 72. Polychatophora lamellosa West & G. S. West, from Cirencester, Gloucestershire (x 370). P. lamellosa West & G. S. West is the only species of the genus and has been found in Gloucestershire amongst Tolypothrix pygmcea. Diam. of cells 19--35 p; thickness of cell-wall 2-8--10-5 p; length of bristles 86--183 p (fig. 72). Family 2. VOLVOCACEl. The plants contained in this family are either unicellular or they consist of definite coenobia of cells. They are distinguished from all other Protococcoideae by being ciliated and motile in their vegetative condition. The coenobia consist of a definite group of cells either united together by protoplasmic processes or superficially arranged within the swollen wall of a mother-cell. The number of cells in any coenobium remains constant so long as the individual exists, and they all arose by cell-division while the plant was still an embryo within the wall of the original mothercell. The cells are rounded, angular, or ovoidal in form, generally with a narrower anterior end to which are attached two, or rarely four, cilia. The protoplasm of the anterior region of the cells is hyaline in character and often contains a prominent pigment spot and two (sometimes more) contractile vacuoles. The pulsation of these vacuoles is alternate. There is a single nucleus, usually occupying a central position in the cell. One chloroplast is present containing one or more pyrenoids, and although its form is very variable, it is generally more or less confined to the broader posterior end of the cell. Multiplication takes place by the division of the contents of a mother-cell into 2, 4, or 8 daughter-cells, and, as the latter are new motile individuals, the vegetative d...
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