. The Eusporangiatae; the comparative morphology of the Ophioglossaceae and Marattiaceae. Ophioglossaceae; Marattiaceae. Fig. 115 A. A nearly median section of an older embryo of D, jamaicensis. The suspensor does not show in this section. B. Three sections of a young embryo of i).e//i/ii(ca. ius, suspensor. X200. Before the first division takes place in the embryo, the fertilized ovum enlarges to several times its original size and becomes decidedly elongated. The first division wall, as in the other Marattiaceae, is transverse, but of the two primary cells thus formed the hypobasal one divid
. The Eusporangiatae; the comparative morphology of the Ophioglossaceae and Marattiaceae. Ophioglossaceae; Marattiaceae. Fig. 115 A. A nearly median section of an older embryo of D, jamaicensis. The suspensor does not show in this section. B. Three sections of a young embryo of i).e//i/ii(ca. ius, suspensor. X200. Before the first division takes place in the embryo, the fertilized ovum enlarges to several times its original size and becomes decidedly elongated. The first division wall, as in the other Marattiaceae, is transverse, but of the two primary cells thus formed the hypobasal one divides no further, or only once, and forms a short sus- pensor which pushes up into the neck of the archegonium whose cells become more or less completely disorganized (fig. 114, A). The next division wall is a nearly median one in the epibasal cell, and this is soon followed by a second wall in each. 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 Campbell, Douglas Houghton, 1859-1953. Washington, D. C. , Carnegie Institution of Washington
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Keywords: ., bookauthorcampbelldouglashought, bookcentury1900, bookdecade1910
