. Fossil plants : for students of botany and geology . Paleobotany. 246 PTERIDOPHYTA. [CH. main characters of the recent genus will enable the student to appreciate the points of difference and agreement between the extinct and present representatives of the Fig. 52. Equisetum maximum Lam. A. Fertile shoot with strobilus and sterile leaf-sheaths [after Luerssen (89); slightly less than nat. size]. B. Sporophyll bearing open sporangia (after Luerssen; slightly enlarged). C. Part of a transverse section (diagrammatic); v, vaUecular canals, e, en- dodermis, u, carinal canals (after
. Fossil plants : for students of botany and geology . Paleobotany. 246 PTERIDOPHYTA. [CH. main characters of the recent genus will enable the student to appreciate the points of difference and agreement between the extinct and present representatives of the Fig. 52. Equisetum maximum Lam. A. Fertile shoot with strobilus and sterile leaf-sheaths [after Luerssen (89); slightly less than nat. size]. B. Sporophyll bearing open sporangia (after Luerssen; slightly enlarged). C. Part of a transverse section (diagrammatic); v, vaUecular canals, e, en- dodermis, u, carinal canals (after Luerssen; x20). D. Equisetum arvense L. Part of a transverse section of an iuternode of a sterile shoot. V, cortex, e, endodermis, x, xylem tracheids, a remains of annular tracheids of the protoxylem, c, carinal canal (after Strasburger; x 90). Equisetuin. The plant consists of a perennial underground creeping rhizome, branching into secondary rhizomes, divided into well- marked nodes and internodes. From the nodes are given off. 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
