. Morphology of gymnosperms. Gymnosperms; Plant morphology. CONIFERALES (PINACEAE) 273 of the first in details, and the two lenticular cells disorganize rapidly (fig. 310), become flattened against the spore wall, and very soon. Figs. 302-313.—Pinus Laricio: a series from the formation of tetrads to the development of the pollen tube; ^, prothallial cells; ^, stalk cell; b, body cell; <, tube nucleus; figs. 302, 303, May 3; fig. 304, May 10; figs. 305-308, May 20; figs. 309-311, May 25; fig. 312, June 15; fig. 313, May i, nearly a year after the stage shown in fig. 312; the exine (c) is sha
. Morphology of gymnosperms. Gymnosperms; Plant morphology. CONIFERALES (PINACEAE) 273 of the first in details, and the two lenticular cells disorganize rapidly (fig. 310), become flattened against the spore wall, and very soon. Figs. 302-313.—Pinus Laricio: a series from the formation of tetrads to the development of the pollen tube; ^, prothallial cells; ^, stalk cell; b, body cell; <, tube nucleus; figs. 302, 303, May 3; fig. 304, May 10; figs. 305-308, May 20; figs. 309-311, May 25; fig. 312, June 15; fig. 313, May i, nearly a year after the stage shown in fig. 312; the exine (c) is shaded with short radial lines, and the intine (i) with longi- tudinal lines; 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; Coulter, John Merle, 1851-1928. Morphology of spermatophytes. Part I. Gymnosperms. Chicago, University of Chicago Press
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