The elements of botany for The elements of botany for beginners and for schools elementsbotany00gray Year: 1887 SECTION 17.] THALLOPHYTES. 169 a small orifice which in each figure is at the margin of the page. The large spores are formed eight together in a mother-cell. The minute motile iilaments of the antheridia fertilize the large spores after injection into the water: and then the latter promptly acquire a cell-wall and germinate. 510. The Floridese or Rose-red series of marine Algse (which, however, are sometimes green or brownish) are the most attractive to amateurs. The delicate Porph
The elements of botany for The elements of botany for beginners and for schools elementsbotany00gray Year: 1887 SECTION 17.] THALLOPHYTES. 169 a small orifice which in each figure is at the margin of the page. The large spores are formed eight together in a mother-cell. The minute motile iilaments of the antheridia fertilize the large spores after injection into the water: and then the latter promptly acquire a cell-wall and germinate. 510. The Floridese or Rose-red series of marine Algse (which, however, are sometimes green or brownish) are the most attractive to amateurs. The delicate Porphyra or Laver is in some countries eaten as a delicacy, and the cartilaginous Chondrus crispus has been largely used for jelly. Besides their conceptacles, which contain true spores (Fig. 560), they mostly have a fructifi- cation in Tetraspores, that is, of spores originating in fours (Fig. 559).
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