. Fossil plants : for students of botany and geology . Paleobotany. 262 LYCOPODIALES [CH. broken up by broad medullary rays as in the common Stigmaria, and in Bothrodendron the occurrence of a ring of primary xylem is another peculiarity. In the vegetative shoots of Bothrodendron mundum the stele differs from those of Lepidodendron in the narrower primary xylem ring and in the large size of the metaxylem tracheae; from Lepidodendron Harcourtii and L. fuliginosum the xylem is distinguished by its smoother outer face which consists of numerous narrow xylem elements.. Fio. 216. Bothrostrobus. I,
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. Fossil plants : for students of botany and geology . Paleobotany. 262 LYCOPODIALES [CH. broken up by broad medullary rays as in the common Stigmaria, and in Bothrodendron the occurrence of a ring of primary xylem is another peculiarity. In the vegetative shoots of Bothrodendron mundum the stele differs from those of Lepidodendron in the narrower primary xylem ring and in the large size of the metaxylem tracheae; from Lepidodendron Harcourtii and L. fuliginosum the xylem is distinguished by its smoother outer face which consists of numerous narrow xylem elements.. Fio. 216. Bothrostrobus. I, ligule. (After Watson.) Cones of Bothrodendron (Bothrostrobus^). The long and narrow cones referred to Bothrodendron minutifolium from English and French Coal-Measures are known only as impressions and it is not possible to say whether they were heterosporous or homosporous; the drawing given by Zeiller (Fig. 212, E) shows that the sporangia were of the same 1 Nathorst (94) A. p. 42.. 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 work.. Seward, A. C. (Albert Charles), 1863-1941. Cambridge : University Press