Inhaltsangabe
This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1898 Excerpt: ...style; n, stigma. (After Berg and Schmidt, magnified.) cecium, on the other hand, are coherent and form collectively a single ovary, which may be either plurilocular when the coherent margins of the carpels extend to the axis, or unilocular if the carpels cohere simply by their edges, and do not turn inward, or only slightly. The double walls or Dissepiments of a plurilocular ovary, formed by the inwardly projecting margins of the coherent carpels, are distinguished as True, in contrast to the False Dissepiments which, in rare cases (e.g. Labiatae), are produced by ingrowths from the internal surface of the carpels. The ovary is prolonged upwards as a neckdike Style, expanded at the apex into a Stigma, which may be of various shapes. The whole organ, consisting of ovary, style, and stigma, is termed the PISTIL. A completely syncarpous gyncecium possesses but one ovary and one stigma (Fig. 378, C). The cohesion of the carpels may, however, be restricted to the basal portions in such a way that the ovary bears as many separate styles, or a style as many stigmas, as the number of carpels united in the ovary (B, D). The reverse case, in which only the upper portions of the carpels cohere, and not the lower, occurs only in the Apocynaceae and Asclepiadaceae. The style exhibits great variation in length and thickness. It is, for example, long and filiform in Crocus, short and thick in Tulipa. It Fig. 379. B, axile; C, free-central placentation. A and B in transverse section, C in longitudinal section. (Diagrammatic.) is either traversed by an axial canal or filled with a loose parenchyma. The stigma may be disc-shaped, ellipsoidal, capitate, bifurcate, or more rarely, as in Iris, corollaceous. Its surface is generally velvet-like, covered with papillae, and is mo...
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