. Plant life, considered with special references to form and function. Plant physiology. SEXUAL REPRODUCTJON'. 293 Loss of sexuality. 396. Among fungi.â'I'hmigh desc ended from ancestors ])Ossessing sexual organs,certain groujis of" plants ha\e lost this mode of reproduction and rely wholly upon non-sexual methods. Such are the higher fungi. The lo^'er forms only have sexual organs. These fungi show their relation to alga; by retaining in part or wholly a(|ua- tic habits. In Cvs/opus, for ex- ample, at a certain stage zo- os[)ores are produced ; and these / " are generally characteri
. Plant life, considered with special references to form and function. Plant physiology. SEXUAL REPRODUCTJON'. 293 Loss of sexuality. 396. Among fungi.â'I'hmigh desc ended from ancestors ])Ossessing sexual organs,certain groujis of" plants ha\e lost this mode of reproduction and rely wholly upon non-sexual methods. Such are the higher fungi. The lo^'er forms only have sexual organs. These fungi show their relation to alga; by retaining in part or wholly a(|ua- tic habits. In Cvs/opus, for ex- ample, at a certain stage zo- os[)ores are produced ; and these / " are generally characteristic of aquatic plants, though Cxstttptis ~>C has become a parasite upon land plants. Many aquatic fungi are known, most of which grow upon dead plants or animals (especially insects) which ha\e r"^ X fallen into the water. Not only do man\' of these lower forms produce zoospores, but the form of their sex-organs and mode of union remind one immedi- ately of similar structure and action in common alg;e. Com- liare, for example, the sex-organs in Vaucheii'a (fig. 308) and those oi Achlvo (fig. 336). Some fungi possess sex-organs which are functionless although the egg de\-elops as though it had been fertilized (fig 336). But in most, all trace of sexual organs has disappeared, though many produce spore-bearing structures, the fructifica-. / -I Fui. 330.âA. 1'uinjtionlt^s stx-urgans of a fungus {A^slilya /r^iiiciUa). IJvaries globular, with 2-4 ; sperniaries from branches of same liypha form fertilizing tube which re- mains closed. />', eggs which ha\-e become resting spores without ferti- lization. Magnified 365 diaiu.â.After .â ^ 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 Barnes, Charles Reid, 1858-1910. New York, H. Holt & company
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