. The elements of botany for beginners and for schools. Botany. 3S6. The Kernel, or Nucleus, is the whole body of the seed withiu tlie coats. Ill many seeds the ker- nel is all Embryo; in others a large part of it is the Al- bumen. For example, in Fig. 423, it is wholly embryo; in Fig. 422, all but the small speck (^(j) is albumen. 387. The Albumen or Endosperm of the seed is sufficiently charac- terized and its ofHcc cxphiiued in Sect. 111., 31-35. 388. The Embryo or Germ, wliich is the rudimentary plantlet and the final result of blossoming, and its development in germination have been exten
. The elements of botany for beginners and for schools. Botany. 3S6. The Kernel, or Nucleus, is the whole body of the seed withiu tlie coats. Ill many seeds the ker- nel is all Embryo; in others a large part of it is the Al- bumen. For example, in Fig. 423, it is wholly embryo; in Fig. 422, all but the small speck (^(j) is albumen. 387. The Albumen or Endosperm of the seed is sufficiently charac- terized and its ofHcc cxphiiued in Sect. 111., 31-35. 388. The Embryo or Germ, wliich is the rudimentary plantlet and the final result of blossoming, and its development in germination have been extensively illustrated in Sections II. and 111. Its essential parts are the Radicle and tlie Cotyledons. 389. Its Radicle or Caulicle (the former is the term long and gener- ally used in botanical descriptions, but the latter is the more correct one, for it is the initial stem, wliich merely gives origin to the root), as to its position in the seed, always points to and lies near the niicropyle. In re- lation to the pericarp it is Superior, when it points to the apex of the fruit or cell, and Inferior, when it points to its base, or downward. 390. The Cotyledons have already been illustrated as re- spects their number, â giving the important distiuction of Dicoty- ledonous, Polycotyledonous and Monocotyledonous embryos (36-43), â also as regards their thickness, whether _/o/2tf^^o«s or _/^s/^^; and some of the very various shapes and adaptations to the seed, have been figured. They may be straight, or folded, or rolled up. In the latter case the cotyledons .may be rolled up as it were from one margin, as in Calycanthus (Fig. 424), or from apex to base in a flat spiral, or they may be both folded {plicate) and rolled up (j'onvolute), as in Sugar j\Iaj)le (Fig. 11.) In one very natural family, the Crnciferae, two ditierent modes prevail in the way the two cotyledons % 'â 'â # Vy are brought round against the radicle. In one series they are. Seed of a Violet (anatropous) : a, h
Size: 1517px × 1647px
Photo credit: © Paul Fearn / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1880, booksubjectbotany, bookyear1887
