The elements of botany for beginners and for schools . ases raised on a slender spore-case loosely bears on its summita thin and pointed cap, like a candle-extin-guisher, called a Cal^ptra. Detaching this, itis found that the spore-case is like a pyxis(376), that is, the top at maturity comes offas a lid {Operculum); and that the interior isfilled with a green powder, the spores, whichare discharged through the open mouth. Inmost Mosses there is a fringe of one or tworows of teeth or membrane around this mouthor orifice, the Peristome. 62S 627 When moist the peristome closes hygromet
The elements of botany for beginners and for schools . ases raised on a slender spore-case loosely bears on its summita thin and pointed cap, like a candle-extin-guisher, called a Cal^ptra. Detaching this, itis found that the spore-case is like a pyxis(376), that is, the top at maturity comes offas a lid {Operculum); and that the interior isfilled with a green powder, the spores, whichare discharged through the open mouth. Inmost Mosses there is a fringe of one or tworows of teeth or membrane around this mouthor orifice, the Peristome. 62S 627 When moist the peristome closes hygrometri-cally over the orifice more or less; when drier the teeth or processescommonly bend outward or recurve; and then the spores more readily es-cape. In Hair-cap Moss a membrane is stretched quite across the mouth,like a drum-head, retaining the spores until this wears away. See Figures527-541 for details. 500. Fertilization in Mosses is by the analogues of stamens and pistils,which are hidden in the axils of leaves, or in the cluster of leaves at the. Fio. 527. Single plant of Physcomitrium pyriforme, , cut across; it consists of a single layer of cells. 8. Top of a 164 CRYPTOGAMOUS OR FLOWERLESS PLANTS. [SECTION 17. end of the stem. The analogue of the anther {Antheridinm) is a cellularsac, which in bursting discharges innumerable delicate cells floating in amucilaginous Lquid; each of these bursts and sets free a vibratile self- 631 631 eil 640
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectbotany, bookyear1887
