. Fossil plants : for students of botany and geology . Paleobotany. 406 BENNETTITALES [CH. surrounded by spirally disposed bracts (fig. 529). A whorl of 18 or 19 nearly mature microsporophyUs is attached to the base of the receptacle (figs. 528, 530); each microsporophyll has a strong rachis extending beyond the apex of the flower-axis. Fig. 530. Cycadeoidsa dacotensis. Transverse sections through a bisporangiate strobilus. A, showing the receptacle with its interseminal scales and ovules, the continuous disc of microsporophylls, in, with vascular bundles, and the separate (m') infolded portio
. Fossil plants : for students of botany and geology . Paleobotany. 406 BENNETTITALES [CH. surrounded by spirally disposed bracts (fig. 529). A whorl of 18 or 19 nearly mature microsporophyUs is attached to the base of the receptacle (figs. 528, 530); each microsporophyll has a strong rachis extending beyond the apex of the flower-axis. Fig. 530. Cycadeoidsa dacotensis. Transverse sections through a bisporangiate strobilus. A, showing the receptacle with its interseminal scales and ovules, the continuous disc of microsporophylls, in, with vascular bundles, and the separate (m') infolded portions of the microsporophyUs with some synangia; bracts and ramenta. B, this section, cut above the apex of the receptacle, shows the microsporophyUs and synangia. (After Wieland.) and bent inwards and downwards with the distal end tucked between the ascending rachis and the receptacle. The slender pinnules, in two alternate series, are bent downwards and bear. 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 Seward, A. C. (Albert Charles), 1863-1941. Cambridge : University Press
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Keywords: ., bookcentury1800, bookdecade1890, bookpublishercambr, bookyear1898
