. Morphology of gymnosperms. Gymnosperms; Plant morphology. CORDAITALES 171 of fibers on both sides; the large bundles are connected by transverse bridges of thick-walled cells; and the mesophyll is compact. Such a form and structure is entirely unlike anything known among ferns or Cycadofilicales, and certainly approximates that of the leaves of Cordaites. Scott (8) says that such a leaf organization is comparable to a single leaflet of such a cycad as Bowenia. THE ROOT Amyelon radicans is a root of the Coal-measures known to belong to Cordaites, and often preserved in remarkable detail (fig.
. Morphology of gymnosperms. Gymnosperms; Plant morphology. CORDAITALES 171 of fibers on both sides; the large bundles are connected by transverse bridges of thick-walled cells; and the mesophyll is compact. Such a form and structure is entirely unlike anything known among ferns or Cycadofilicales, and certainly approximates that of the leaves of Cordaites. Scott (8) says that such a leaf organization is comparable to a single leaflet of such a cycad as Bowenia. THE ROOT Amyelon radicans is a root of the Coal-measures known to belong to Cordaites, and often preserved in remarkable detail (fig. 203). It bears irregularly arranged bunches of lateral roots, which have been examined recently by Osborn (26). The thick cortex is. Fig. 203.—Amyelon, the root oi Cordaites: p, tetrarch primary xylem; x, secondary xylem showing growth rings; pk, phloem; d, periderm; Xg.—From photomicro- graph of section made by LoMAX. divisible into two regions, the inner of which contains dark cells that show fungal hyphae. The conclusion is reached that "Cordaites was probably a tree inhabiting saline swamps, and having bunches of coralline rootlets on its roots, such as are known to occur in many recent plants growing under similar ; As only one case. 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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