. Nature and development of plants. Botany. 304 SPOROPHYTE OF THE BRYALES reservoirs (Fig. 206, D). During drought, this delicate apparatus is protected by the coiling of the leaves into needle-like rolls which result in the exposure only of the thickened epidermal cells. The sexual organs are developed on the apices of the main or lateral branches and they are protected by modified leaves which are often colored and form a more or less conspicuous bud or cup (Fig. 207, i). This is especially true of the antheridial buds, the plants being monoecious or dioecious. The antheridia and archegonia
. Nature and development of plants. Botany. 304 SPOROPHYTE OF THE BRYALES reservoirs (Fig. 206, D). During drought, this delicate apparatus is protected by the coiling of the leaves into needle-like rolls which result in the exposure only of the thickened epidermal cells. The sexual organs are developed on the apices of the main or lateral branches and they are protected by modified leaves which are often colored and form a more or less conspicuous bud or cup (Fig. 207, i). This is especially true of the antheridial buds, the plants being monoecious or dioecious. The antheridia and archegonia are essentially of the same structure as noted in. Fig. 209. Germination of the garaetospore: 10, base of the archegonium in which the gametospore has germinated, forming a mass of cells with apical growing cell, x. 11, later growth of the gametospore. The sporophyte, spr, still enveloped by the archegonium, ar, appears as a cylindrical mass of cells with foot, b, penetrating the stem of the moss plant. At right an unfertilized archegonium. See Fig. 205, B.—After Sachs. previous groups and they are usually associated with modified leaves known as paraphyses (Figs. 207, 6; 208). ^ The germina- tion of the gametospore and the development of the sporophyte, while presenting many features in common with the hepatics and Anthoceros in particular,~shows a remarkable series of varia- tions that are of decided advantage to the plant. The gameto- spore in its early growth forms a spindle-shaped mass of cells,. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Curtis, Carlton Clarence, 1864-1945. New York, H. Holt
Size: 1530px × 1633px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, bookpublisher, booksubjectbotany
