. Plants and their uses; an introduction to botany . um in which the egg-ceil has begun to , embryo of sporophyte showing shoot-part above and foot below.(Hofmeister.) True mosses liverworts except in having a nwdbj creelgametophyle loith pseiulo-leares spirally disposed about a pseudo-stem which supports a sporangium dehiscing by a lid and lacking ela-ters. These peculiarities are shown in the peat moss (Sphagnum,Figs. 227, 346-349) and the cord moss (I<\maria, Figs. 300-356). The spores of Sphagnum (Fig. 346) germinate in water by sciul-ing out a branched thread which r
. Plants and their uses; an introduction to botany . um in which the egg-ceil has begun to , embryo of sporophyte showing shoot-part above and foot below.(Hofmeister.) True mosses liverworts except in having a nwdbj creelgametophyle loith pseiulo-leares spirally disposed about a pseudo-stem which supports a sporangium dehiscing by a lid and lacking ela-ters. These peculiarities are shown in the peat moss (Sphagnum,Figs. 227, 346-349) and the cord moss (I<\maria, Figs. 300-356). The spores of Sphagnum (Fig. 346) germinate in water by sciul-ing out a branched thread which resembles a filamentous or later tliis thread gives at several points to apical cellseach of which by its frequent oblicjue divisions produces a with pseudo-leaves. If, however, the spore falls upon moistearth, its germination is more like such a liverwort as Anthocerosor Marchantia, for the initial thread soon develops into a flat-lobed thallus, producing slender below, and vertical THE TRUE jVIOSSES 523. Fig. 345.—^Horned-livcrwort. Young sporophyte {sg, sg) showing the be-ginnings of a columella (c, c) and spores (s). L, L, calyptra, ^ja.(Hofmeister.) Fig. 346.—Peat moss (Sphagnum acutifnlium. Peat moss Family, Sphagna-cece). A, spore, highly magnified. C, spore (s) germinating in waterproducing a green liranched thread or prolonema (n, 7t) from whichbuds (pr, pr) arise and produce gametophytes. (Schimper.)—Plantcommon in bogs. Fig. 347. — Peatmoss. Flat pro-tonema (pr, pr)produced onmoist earth, giv-ing r i s e to agametoph>-te (m)and pseudo-roots(w),<-fa. (Schimp-er.)
Size: 1597px × 1565px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, booksubjectbotany, bookyear1913
