. Carnegie Institution of Washington publication. Fig. 109. A. Two sections of a young embryo of Angiopteris. The cells were badly shrunken. B. Diagrams showing arrangement of cells of same embryo. C. An older embryo, b b, basal wall; sr, stem apex; cot, cotyledon; f, foot. and the quadrant divisions are often still evident. Whether octant divisions are formed in all the quadrants could not positively be determined, but Jonkmann states that such is the case. There can usually be found in the young embryo a nearly centrally placed large cell (tig. log, C, si), which probably is the initial cell
. Carnegie Institution of Washington publication. Fig. 109. A. Two sections of a young embryo of Angiopteris. The cells were badly shrunken. B. Diagrams showing arrangement of cells of same embryo. C. An older embryo, b b, basal wall; sr, stem apex; cot, cotyledon; f, foot. and the quadrant divisions are often still evident. Whether octant divisions are formed in all the quadrants could not positively be determined, but Jonkmann states that such is the case. There can usually be found in the young embryo a nearly centrally placed large cell (tig. log, C, si), which probably is the initial cell of the young stem. The position of this cell is not unlike that which occurs in the. Fig. 110. Two longitudinal sections of an older embryo of Angiopteris. X200. The young root, r, is shown in /?. st, stem apex; cot, cotyledon; /, foot. embryo of Equisetum, and at this stage there is also a certain resemblance to the em- bryo of Botrychtum virginianum. As the embryo grows it tends to assume a more nearly globular form (fig. no). The basal wall can still be imperfectly followed, the hypobasal portion of the embryo being made up of the large cells forming the foot, while above the basal wall the cell divisions are more active and the rudiments 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 Carnegie Institution of Washington. Washington, Carnegie Institution of Washington
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Keywords: ., bookauthorcarnegie, bookcentury1900, bookdecade1910, bookyear1911
