. The classification of flowering plants. Plants. 44 FLOWERING PLANTS [CH parenchyma was traversed by secretory sacs, and strengthened by hypodermal, radial bands of fibres; the leaf-trace was often a double bundle. A thick and complicated bark covered the larger Fig. 1. Cordaites. A. Longitudinal section of a male cone shewing bracts and stamens (as at /), the latter bearing pollen-sacs (as at e) x 3. B. A stamen more highly magnified bearing four pollen-sacs, that on the right has dehisced. A vascular bundle runs up the filament and branches below the pollen-sacs. C. Longitudinal som
. The classification of flowering plants. Plants. 44 FLOWERING PLANTS [CH parenchyma was traversed by secretory sacs, and strengthened by hypodermal, radial bands of fibres; the leaf-trace was often a double bundle. A thick and complicated bark covered the larger Fig. 1. Cordaites. A. Longitudinal section of a male cone shewing bracts and stamens (as at /), the latter bearing pollen-sacs (as at e) x 3. B. A stamen more highly magnified bearing four pollen-sacs, that on the right has dehisced. A vascular bundle runs up the filament and branches below the pollen-sacs. C. Longitudinal somewhat tangential section of a female cone shewing the bracts, in the axil of two of which are ovuliferous shoots; a, axis of ovuliferous shoot bearing a lateral bracteole (b) and a terminal ovule; i, outer integument; n, nucellus. D. Apex of ovule more highly magnified shewing canal leading to pollen- chamber; i, dilated cells of integument; p, pollen-grain. E. Transverse section of leaf, e, epidermis below which are supporting layers of sclerenchyma, s, more strongly developed opposite the two mesarch vascular bundles. The bundles are surrounded by a sheath, sh; in the left-hand bundle are indicated the centripetal xylem a, the protoxylem j), the centrifugal xylem c, below which is the phloem b. Transversely elongated cells connect the bundles. (A—E after Eeuault.) F. Branch, shewing the large leaves, a vegetative bud (b), and the fertile branches each bearing numerous cones. Keduced. (From Scott, after Grand' Eury.) The roots, which were diarch, triarch or tetrarch, shew a thick zone of secondary wood, made up of pitted elements with medullary rays and agreeing in all essential respects with the wood of the stem. On the outside was a broad zone of 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 work.
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectplants, bookyear1904
