. Morphology of spermatophytes. [Part I. Gymnosperms]. Gymnosperms; Plant morphology. Fig. 89.—Ephedra: A, young ovule showing a row of three potential raegaspores; £, upper part of nuoellus after fertilization, showing the free cells of the proembryo two oospores, x 64; 0, suvspensors developing from the free cells, passing from the oospore into the endosperm, and each bearing at tip an embryonal cell, X 64; D-F, later stages in the development of the embryo, x 15i\ A, E. campy- B-F, E. aUissima.—After Sthasbuhgek. Ephedra.—According to Strasburger's account ^ for E. cam- pylopoda,
. Morphology of spermatophytes. [Part I. Gymnosperms]. Gymnosperms; Plant morphology. Fig. 89.—Ephedra: A, young ovule showing a row of three potential raegaspores; £, upper part of nuoellus after fertilization, showing the free cells of the proembryo two oospores, x 64; 0, suvspensors developing from the free cells, passing from the oospore into the endosperm, and each bearing at tip an embryonal cell, X 64; D-F, later stages in the development of the embryo, x 15i\ A, E. campy- B-F, E. aUissima.—After Sthasbuhgek. Ephedra.—According to Strasburger's account ^ for E. cam- pylopoda, the mother cells organize a row of three potential megaspores, the lowest of which is the fertile one (Fig. 89, A). In case several fertile megaspores begin to enlarge, one finally dominates and develops the gametophyte. The details of the germination of the megaspore are lacking, but Strasburger's outline is tlie usual one among 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
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Keywords: ., bookauthorcoulterj, bookcentury1900, bookdecade1900, bookyear1901
