. Morphology of gymnosperms. Gymnosperms; Plant morphology. CONIFERALES (PINACEAE) 239 two sets of sporophylls to one another is that found in the strobilus of Bennettitales, in the so-called "flower" of Welwitschia, and in the Fig. 261.—Bisporangiate strobili of Abies: the staminate strobilus at the lower right corner is almost normal; all the others have microsporangia both above and below, with ovuliferous scales between. angiosperm flower. It is to be expected that other cases of bi- sporangiate strobili will be reported, but they are evidently of very rare occurrence among Pinac
. Morphology of gymnosperms. Gymnosperms; Plant morphology. CONIFERALES (PINACEAE) 239 two sets of sporophylls to one another is that found in the strobilus of Bennettitales, in the so-called "flower" of Welwitschia, and in the Fig. 261.—Bisporangiate strobili of Abies: the staminate strobilus at the lower right corner is almost normal; all the others have microsporangia both above and below, with ovuliferous scales between. angiosperm flower. It is to be expected that other cases of bi- sporangiate strobili will be reported, but they are evidently of very rare occurrence among Fig. 262.—Microsporangia from the strobili shown in fig. 261: A, normal sporo- phyll, side view; B, slightly modified sporophyll from the summit of a bisporangiate strobilus; C, D, side and front views of sporophylls from the summit of a bisporan- giate strobilus; E, F, side and front views of sporophylls from the base of a bisporan- giate 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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