. A manual of botany. Botany. Fig. Fig. 786. Antlieridia, a, a, on the branched hairs of the male oonoeptacle. After Thuret. Fig. 787. Oogonium with the oospheres fully separated, and disengaging themselTes from their coTerings. After Thuret. Fig. 788. An oosphere without a cellulose coat being fertilised by anthe- rozoids so as to form an oospore. which they are formed. In Cutleria the gametes are dissimilar in size, but both are ciliated. The larger comes to rest soonest, and one of the smaller fuses with it. More completely differen- tiated gametes are found in higher forms (figs. 787
. A manual of botany. Botany. Fig. Fig. 786. Antlieridia, a, a, on the branched hairs of the male oonoeptacle. After Thuret. Fig. 787. Oogonium with the oospheres fully separated, and disengaging themselTes from their coTerings. After Thuret. Fig. 788. An oosphere without a cellulose coat being fertilised by anthe- rozoids so as to form an oospore. which they are formed. In Cutleria the gametes are dissimilar in size, but both are ciliated. The larger comes to rest soonest, and one of the smaller fuses with it. More completely differen- tiated gametes are found in higher forms (figs. 787 and 789) ; oospheres are developed in oogonia and antherozoids ia an- theridia. When the gametes are alike the reproduction is called isogamous ; when they are different in size and behaviour it is said to be oogamous. In the Bhodophyoes the antherozoid is not ciliated and there is no differentiated oosphere. Instead of an oogonium the female organ is known as a carpogonium. It is frequently multicellular, and fertilisation is brought about through a filiform or elongated cell known as a Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Green, J. Reynolds (Joseph Reynolds), 1848-1914. London, J. & A. Churchill
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