. Text-book of botany, morphological and physiological. Botany. FIG. 322.—Development of the sporangium of Pilularia globulifera, all the figures in optical longitudinal section; IV c primary mother-cell of the spores invested by the tapetum; sm mother-cells of the spores (X 550). FIG. 323.—Development of the macrospore of Pilularia globulifera; x the abortive sister-cells, m the macrospore, A'its nucleus, a the inner, b the outer coat. of very considerable size; its aborted sister-cells are attached to it laterally (Fig. 324, x), and its firm coat has become brown and is invested by a layer o
. Text-book of botany, morphological and physiological. Botany. FIG. 322.—Development of the sporangium of Pilularia globulifera, all the figures in optical longitudinal section; IV c primary mother-cell of the spores invested by the tapetum; sm mother-cells of the spores (X 550). FIG. 323.—Development of the macrospore of Pilularia globulifera; x the abortive sister-cells, m the macrospore, A'its nucleus, a the inner, b the outer coat. of very considerable size; its aborted sister-cells are attached to it laterally (Fig. 324, x), and its firm coat has become brown and is invested by a layer of mucilage (Fig. 323, IV, b) which often appears to be folded. It forms a papilla (Fig. 324, b') at the apex which shrivels when the spore ripens. A layer of a soft substance, presenting a distinctly prismatic structure, makes its appearance (Fig. 324, C) on the outside of the mucilaginous layer, and becomes in its turn invested by a third layer which is thicker than itself of a less distinctly organised structure. Both these layers leave the apex of the spore uncovered and form a funnel through which the. 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 Sachs, Julius, 1832-1897; Vines, Sydney Howard, 1849-1934. ed. and tr. Oxford, Clarendon press
Size: 1553px × 1608px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1880, booksubjectbotany, bookyear1882
