Organography of plants, especially of the archegoniatae and spermaphyta . ONIUM OF MUSCI capsule; the outer bend backwards. In Orthotrichum callistomum the teethof the peristome hang together in the centre, and there is formed a caster. Fontinalis and Cinclidium. A caster is also produced in Fontinalis, wherethe inner peristome makes a delicate trellis-work ; also in Cinclidium, where itappears as a dome with sixteen holes at its base, which are closed in moist air bythe teeth of the outer peristome. Funaria. The teeth of the outer peristome in Funaria converge togetherat the tip, and they for
Organography of plants, especially of the archegoniatae and spermaphyta . ONIUM OF MUSCI capsule; the outer bend backwards. In Orthotrichum callistomum the teethof the peristome hang together in the centre, and there is formed a caster. Fontinalis and Cinclidium. A caster is also produced in Fontinalis, wherethe inner peristome makes a delicate trellis-work ; also in Cinclidium, where itappears as a dome with sixteen holes at its base, which are closed in moist air bythe teeth of the outer peristome. Funaria. The teeth of the outer peristome in Funaria converge togetherat the tip, and they form a sieve there. The teeth of the inner peristome bend sothat they narrow the position where the slits between the teeth of the outer peri-stome are the widest. In moist air the slits, through movement of the teethof the outer peristome, are completely closed. Type of Buxbaumia. The inner peristome is a funnel, composed of afolded membrane, and with a narrow mouth. This alone exists in Diphysciumand Buxbaumia aphylla. In Buxbaumia indusiata there are traces of an outer. Fig. i2g. Buxbaumia indusiata. Not quite mature peristome in transverse section; /%, peristorae-membrane ; Pa, outer peristome-teeth. peristome (Fig. 129) in the form of small teeth whose function is unknown. Thefolded peristome of the Buxbaumiaceae arises through a special process ofdivision in a ring-like cell-layer^ which we must regard as the original positionof the peristome. Probably in all Musci the origin of the peristome may betraced back to the innermost cell-layer of the amphithecium, which layer, however,may itself undergo divisions, as in the Buxbaumiaceae and Polytrichaceae. Therewould be then, if this were general, a certain analogy with the archesporium, whichalso is laid down in all Musci as one cell-layer. This point requires furtherinvestigation. At any rate the difference in the formation of the peristome withinthe genus Buxbaumia shows us again, what has been already suggested uponother grou
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