Nature and development of plants . ed (Fig. 228, C), owing to the more rapid growth of thecells that are cut off from the apical cell. In some generabranched filamentous or narrowly thalloid growths are developedthat resemble the protonema of the mosses or the thallose hepat-ics. The gametophyte usually lives but a few months, although ;oo OF FILICALES in some species they may endure for years, multiplying exten-sively by gemmae, and so form conspicuous mats upon the moisttrunks and rocks. The archegonia and anthericlia are usuallyborne upon the same gametophyte. Some genera, howe
Nature and development of plants . ed (Fig. 228, C), owing to the more rapid growth of thecells that are cut off from the apical cell. In some generabranched filamentous or narrowly thalloid growths are developedthat resemble the protonema of the mosses or the thallose hepat-ics. The gametophyte usually lives but a few months, although ;oo OF FILICALES in some species they may endure for years, multiplying exten-sively by gemmae, and so form conspicuous mats upon the moisttrunks and rocks. The archegonia and anthericlia are usuallyborne upon the same gametophyte. Some genera, however, arestrictlv dioecious, producing small antheridial or male gameto-phytes and larger archegonial or female gametophytes. Smallmale gametophytes occur not uncommonly among any of thegenera, owing doubtless to their poorer nourishment. The sex-ual organs are developed upon the under side of the gametophyte(Fig. 228, C), probably because this position is of advantage inkeeping them in contact with any water that may fall upon the.
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