. Fossil plants : for students of botany and geology . Paleobotany. 22 CYCADALES [CH. goose's egg: the sterile distal end has the form of a spear-point with an irregularly serrate edge. In C. revoluta, C. pectinata, etc., the sterile part is deeply dissected and may break off (fig. 392, A) from the fertile portion of the sporophyll. The megasporophylls. Fia. 393. A. Stangeria paradoxa, part of microstrobilus. B, D. Encephalartos villosus, megastrobilus in surface-view and in section. (\ nat. size.) C. Ceratozamia mexicana, single megasporophyll. of C. Riuminiana exhibit a striking variation in
. Fossil plants : for students of botany and geology . Paleobotany. 22 CYCADALES [CH. goose's egg: the sterile distal end has the form of a spear-point with an irregularly serrate edge. In C. revoluta, C. pectinata, etc., the sterile part is deeply dissected and may break off (fig. 392, A) from the fertile portion of the sporophyll. The megasporophylls. Fia. 393. A. Stangeria paradoxa, part of microstrobilus. B, D. Encephalartos villosus, megastrobilus in surface-view and in section. (\ nat. size.) C. Ceratozamia mexicana, single megasporophyll. of C. Riuminiana exhibit a striking variation in form (fit?. .392, B, C); some are 15 cm. long with several ovules, while others^ reduced to 8 cm., bear only two ovules and resemble the sporo- phylls of Dioon. In all other genera the megasporophylls are. 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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