Nature and development of plants . Fig. Fig. 118. Fig. 117. Colcochaete, showing the radiating filaments and hair-like out-growths of the cells. Fig. 118. Sexual reproduction of Colcochaete: A, end of a filamentbearing the male, an, and female, og, reproductive organs. B, the gameto-spore is being enveloped by the adjacent filaments of the plant. C, gameto-spore germinating. Eight cells have been formed, rupturing the walls ofthe gametospore.—After Oltmanns. i8o TENDENCIES IN THE CHLOROPHYCEAE 117). The advance of this type is indicated not only by thelocalization of growth at definite p
Nature and development of plants . Fig. Fig. 118. Fig. 117. Colcochaete, showing the radiating filaments and hair-like out-growths of the cells. Fig. 118. Sexual reproduction of Colcochaete: A, end of a filamentbearing the male, an, and female, og, reproductive organs. B, the gameto-spore is being enveloped by the adjacent filaments of the plant. C, gameto-spore germinating. Eight cells have been formed, rupturing the walls ofthe gametospore.—After Oltmanns. i8o TENDENCIES IN THE CHLOROPHYCEAE 117). The advance of this type is indicated not only by thelocalization of growth at definite points, but also by the formationof the zoospores and gametes in definite regions, i. c, in specialcells which are usually located at the end of the filaments. Thezoospores are produced singly from such cells and from smallerpear-shaped cells single male gametes are formed. The femalegametes are developed singly in large flask-shaped cells, accessto which is afforded by an opening that appears at the end ofthe long neck of the flask (Fig. 1
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