. Plants and their uses; an introduction to botany . hcRonium showing tlu- swollen lower part (h) con-taining an unfertilized egg-cell, the neck (/)) with its orifice (m) stillclosed and the axial row of cells being converted into mucilage, *,, orifice of an archegonium after fertilization, with its ccll-wallacolored dark red, sji*. (Sachs.) Fig. 354.— A, embryo of sporophyto (/, /) still within the arche-gonium (b, h), cut vertically, h, being the neck, l^. B, C, more ad-vanced stages in the dr-velopment of the sporophyte (/) ctnered by theold archegonium or calyptra (c) upon wl
. Plants and their uses; an introduction to botany . hcRonium showing tlu- swollen lower part (h) con-taining an unfertilized egg-cell, the neck (/)) with its orifice (m) stillclosed and the axial row of cells being converted into mucilage, *,, orifice of an archegonium after fertilization, with its ccll-wallacolored dark red, sji*. (Sachs.) Fig. 354.— A, embryo of sporophyto (/, /) still within the arche-gonium (b, h), cut vertically, h, being the neck, l^. B, C, more ad-vanced stages in the dr-velopment of the sporophyte (/) ctnered by theold archegonium or calyptra (c) upon wliich the neck (/() still remains,i. (Sachs.) to manufacture a large part of its own food while the latter is likethe sporophytes of Riccia and Marchantia in being entirely para-sitic upon the gametophyte. Inorganic materials absorbed by theslender pseudo-roots of the gametophyte are suppliecl to the footof the stalk and thence conducted to the photosynthetic tissue ofthe capsule. Conduction take places mainly through a central THE TRUE MOSSES 529. Fig. 355.— .-1, female gametophj-te bearing pseudo-leaves (g)and a calyptra (c) still protecting a young sporophyte, }. B, same, ata later stage when the calj-ptra (c) has been carried up as a hood on topof the spore-case (/) by the elongation of the stalk (s) of the sporophyte,r. C, spore-case or capsule, enlarged and cut vertically to show thelid (d), a connecting row of cells, the annulus (a), a row of projections,the peristome (p) covering the mouth, a central mass of cells, thecolumella (c, c), air spaces (h), and the layer of spores (s), i. (Sachs.)
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectbotany, bookyear1913
