. Botany for high schools and colleges. Botany. 358 BOTANY. The genus Sphagnum was represented in the Tertiary (Miocene) of Euif)pe. Order Andrseaceee.âIn this small order the little plants of which, it is composed have a short-stalked sporogonium, raised upon a pseudo- podium, as in the Sphagnaceca; the sporogonium contains a layer of spore-forming tissue, disposed as in the preceding order ; but the ripe capsule opens by splitting into four longitudinal valves, in this remind- ing one of the Jungermanniacem. In the growth of the sporogonium the old archegonium is torn away at its base, and c
. Botany for high schools and colleges. Botany. 358 BOTANY. The genus Sphagnum was represented in the Tertiary (Miocene) of Euif)pe. Order Andrseaceee.âIn this small order the little plants of which, it is composed have a short-stalked sporogonium, raised upon a pseudo- podium, as in the Sphagnaceca; the sporogonium contains a layer of spore-forming tissue, disposed as in the preceding order ; but the ripe capsule opens by splitting into four longitudinal valves, in this remind- ing one of the Jungermanniacem. In the growth of the sporogonium the old archegonium is torn away at its base, and carried up as a cap (calyptra), which covers the apex of the capsule. The principal genus is Andrcea, represented in the United States by a few alpine or sub-alpine species of brownish or blackish rock-loving Mosses. Order Phascaceae.âThese small Mosses are peculiar in having but a little development of leafy axis, and in their persistent protonema. The sporogonium is short-stalked, or ses- sile, and the pseudopodium is very short, or entirely wanting. The spores are, in the simplest genus {Ar- chidium), developed from a single mother-cell, while in the higher ones they develop from a layer of mother- cells, much as in the next order. The capsule is indehiscent, and the spores are set free only by its decay. roofonuim,/â ; c, the calyptra; s, seta. The old archegonium persists as a C\ lougitudinal section of a capsule ; pâi.,^trn rnvprino- tliP r-nnmilp c, c, columella; d, operculum or lid, calyptra covering tne capsule, which will separate from the remainder The principal genera are ArcMdi- of the capsule at a: p, peristome ; s, y,, i r> i ⢠mi spore-bearing layer; A, air cavity sur- um, Plmscum, and Brucllia. The rounding the columella, and crossed by species are terrestrial, and many are confervoid filaments ; t, inferior con- .. n.'Ction of the columella with the tissues annuals. of the capsule. ^ and ^ slightly mag- i^ the Tertiary (Miocene) of Eu- nified ; V abou
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