. Morphology of gymnosperms. Gymnosperms; Plant morphology. BENNETTITALES 8t Structure. A most interesting feature is the occurrence of a basal cupule, for it suggests a remnant of the completely investing cupules of certain seeds (Lagenostoma) of Cycadofilicales. The usual nucel- lar beak and large pollen chamber, characteristic of this type of ovule,. Fig. 65.—Cycadeoidea Wielandii: transverse section of a portion of the seed- bearing strobilus, showing seed-stalks with their central bundles, and interseminal scales packed between.—From photograph by Beechee of section made by Wieland. are e
. Morphology of gymnosperms. Gymnosperms; Plant morphology. BENNETTITALES 8t Structure. A most interesting feature is the occurrence of a basal cupule, for it suggests a remnant of the completely investing cupules of certain seeds (Lagenostoma) of Cycadofilicales. The usual nucel- lar beak and large pollen chamber, characteristic of this type of ovule,. Fig. 65.—Cycadeoidea Wielandii: transverse section of a portion of the seed- bearing strobilus, showing seed-stalks with their central bundles, and interseminal scales packed between.—From photograph by Beechee of section made by Wieland. are evident, and also a heavy megaspore membrane. It must be recognized that the structure of the seeds of Bennettitales is not known with such completeness as is that of Lagenostoma, so that a definite comparative statement is impossible at present. The conjectural situation is possibly the true one, which the abundance of material should soon 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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