Text-book of structural and physiological botany . in the Phascaceae, irregularly. The opening re-sulting from the operculum being thrown off, is called thestoma ] its margin is either smooth {gymnostomous), or isfurnished with two rows of cilia or teeth of beautiful form,constituting together the peristo77ie (Fig. 430), the nature ofwhich furnishes a character for the classification of thegenera. The antheridia are usually in groups, and are sur-rounded by an envelope of peculiar leaves, the perigonium(Fig. 427 IV.). Among the antheridia are filiform struc-tures—possibly abortive leaves—the p
Text-book of structural and physiological botany . in the Phascaceae, irregularly. The opening re-sulting from the operculum being thrown off, is called thestoma ] its margin is either smooth {gymnostomous), or isfurnished with two rows of cilia or teeth of beautiful form,constituting together the peristo77ie (Fig. 430), the nature ofwhich furnishes a character for the classification of thegenera. The antheridia are usually in groups, and are sur-rounded by an envelope of peculiar leaves, the perigonium(Fig. 427 IV.). Among the antheridia are filiform struc-tures—possibly abortive leaves—the paraphyses. [Theantheridia produce a number of extremely minute anthero-zoids (Figs. 427 v., 428)]. On germination the spore putsout first of all a pro-embryo, which is either filiform, when it special Morphology and Classification^ 305 is called a protonema, or thalloid, when it is a prothallium ;and on it the young plant is developed. Besides the reproduction by spores, Mosses are alsopropagated asexually by gemmcB and by stolons. Those ir;.
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