. Fundamentals of botany. Botany. SEED-BEARING PLANTS 419 reproduction. The central axis bears lateral scales (Figs. 309 and 310), but the homology of these scales is difficult to determine, and is still a ttitfef < - There are. Fig. 309.—Scotch pine (Finns syheslris). A—D, stages in the develop- ment of the carpellate cone, and its carpotropic movements. E, very young carpellate cone much enlarged; F, ventral, G, dorsal views of a scale from E; i, oNijliferous scale; 2, ovule (in'longitudinal section); 3, pollen chamber and micropyle leading to the apex of the nucellus (mega- spo
. Fundamentals of botany. Botany. SEED-BEARING PLANTS 419 reproduction. The central axis bears lateral scales (Figs. 309 and 310), but the homology of these scales is difficult to determine, and is still a ttitfef < - There are. Fig. 309.—Scotch pine (Finns syheslris). A—D, stages in the develop- ment of the carpellate cone, and its carpotropic movements. E, very young carpellate cone much enlarged; F, ventral, G, dorsal views of a scale from E; i, oNijliferous scale; 2, ovule (in'longitudinal section); 3, pollen chamber and micropyle leading to the apex of the nucellus (mega- sporangium); 4, integument of the ovule; G, i, tip of ovuliferous scale; 5, bract; 4, integument; H, longitudinal section at right angles to the surface of the ovuliferous scale (diagrammatic); 6, megaspore; 7, pollen- chamber; /, longitudinal section of a mature cone; 6, ovule; /, scale from a mature cone; 6, seed; w, wing of seed; K, dissection of mature seed; h, hard seed coat; c, dry membraneous remains of the nucellus, here folded back to show the endosperm and embryo; e, embryo; p, remains of nucellus; L, embryo; c, cotyledons; e, hypocotyl; r, root-end. good reasons for considering that they are not simple spor- ophylls, but are of a more complex character. Each scale comprises a bract and an ovuliferous (ovule- bearing) scale (Fig. 309). It is probable (but not certain). 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 Gager, C. Stuart (Charles Stuart), 1872-1943. Philadelphia, P. Blakiston's son & co.
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Keywords: ., bookauthorgag, bookcentury1900, bookdecade1910, booksubjectbotany
