. Morphology of angiosperms (Morphology of spermatophytes. Part II). Angiosperms; Plant morphology. B Treiib18 for Listera ovata and Epipactis palustris, and by LeavittT3 for certain species of Goodyera and Spiranthes. It should be noted, however, that in Lemna (Caldwell"4), the reduced aquatic ally of the Araceae, a mul- ticellular suspensor is formed, the embryo resembling the Lili- um type described be- low. Among the Lilia- ceae a third type of e in b r y o - f o r m a t i o n seems to prevail. After the first segmentation of the fertilized egg, which is transverse, the subsequent div
. Morphology of angiosperms (Morphology of spermatophytes. Part II). Angiosperms; Plant morphology. B Treiib18 for Listera ovata and Epipactis palustris, and by LeavittT3 for certain species of Goodyera and Spiranthes. It should be noted, however, that in Lemna (Caldwell"4), the reduced aquatic ally of the Araceae, a mul- ticellular suspensor is formed, the embryo resembling the Lili- um type described be- low. Among the Lilia- ceae a third type of e in b r y o - f o r m a t i o n seems to prevail. After the first segmentation of the fertilized egg, which is transverse, the subsequent divi- sions are very irregu- lar, being transverse, oblique, or longitudi- nal in either cell, re- sulting in a massive proembryo. The dif- ferentiation into em- bryo and suspensor is late and irregular, the suspensor being mass- ive, and inclined to continue active divi- sion until the end of the embryo-sac is oc- cupied by a spreading suspensor tissue (Fig. 85). This is characteristic of Lilium (Coulter44), Erythronium fSchaffner72), Tulipa fErnst69), and probably all the allied forms, and the meristematic activity of the suspensor is apt to result in polyembryony (see below). Just how far this Lillian type of embryo is represented among Liliales must be determined by future investigation, but it is distinct enough to deserve separate Fig. 85.—Lilium philaddphicum. A, proembryo of two cells; x 300; £, middle cell of filament of three cells has divided longitudinally; x 175; C\ young embryo showing massh'e suspensor; x 300; /), older embryo, showing different form of sus- pensor ; x 300.—After ;. 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 Coulter, John Merle, 1851-1928; Chamberlain, Charles Joseph, b. 1863. New York, D. Appleton
Size: 1808px × 1382px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorcoulterj, bookcentury1900, bookdecade1900, bookyear1903
