Fig. 348-350. Three early stages in the growth of ovule of a Magnolia, showing the forming outer and inner coats which even in the later figure have not yet completely enclosed the nucleus; 351, further advanced, and 352, completely anatropous ovule.
Fig. 353. Longitudinal section, and 354, transverse section of 352.
Fig. 355. Same as 353, enlarged showing the parts in section: a, outer coat; b, inner coat; c, nucleus; d, rhaphe.
Anatropous or Inverted, as in Fig. [347], the commonest kind, so called because in its growth it has as it were turned over upon its stalk, to which it has continued adnate. The organic base, or chalaza, thus becomes the apparent summit, and the orifice is at the base, by the side of the hilum or place of attachment. The adnate portion of the funiculus, which appears as a ridge or cord extending from the hilum to the chalaza, and which distinguishes this kind of ovule, is called the Rhaphe. The amphitropous ovule (Fig. [346]) has a short or incomplete rhaphe.
322. Fig. [348-352] show the stages through which an ovule becomes anatropous in the course of its growth. The annexed two figures are sections of such an ovule at maturity; and Fig. [355] is Fig. [353] enlarged, with the parts lettered.