. A manual of the North American gymnosperms [microform] : exclusive of the cycadales but together with certain exotic species. Bois; Trees; Gymnosperms; Gymnospermes; Arbres; Wood. BORDERED PITS 73 genera must have passed. And inasmuch as this genus ex a more highly developed multiseriate arrangement than any other within the general phylum, we must concede that it IS, with respect to this character, the most primitive of all. Serial Variations in the Borderei. Fits ok Corimites. C. acadianum ohioense . . ouangondianum materiarium Clarkei . annulatum Brandlingii materioide illinoLsense
. A manual of the North American gymnosperms [microform] : exclusive of the cycadales but together with certain exotic species. Bois; Trees; Gymnosperms; Gymnospermes; Arbres; Wood. BORDERED PITS 73 genera must have passed. And inasmuch as this genus ex a more highly developed multiseriate arrangement than any other within the general phylum, we must concede that it IS, with respect to this character, the most primitive of all. Serial Variations in the Borderei. Fits ok Corimites. C. acadianum ohioense . . ouangondianum materiarium Clarkei . annulatum Brandlingii materioide illinoLsense hamiltoneiiMe Newberryi recentium The genus Araucaria shows a much more restricted range of variations, there being only four variants pretty uniformly dis- tributed among fourteen species, both recent and fossil (a^tc p. 61). While the most highly developed members, four in num' l)er are represented by one-seriate pits, the most primitive form of four-senate pits occurs in only one case,-A. Robertianum It ,s therefore manifest that this genus is obviously of a more type than Cordaites, from which it undoubtedly origi- nated. Dammara being represented by only one s,>ecies, it ^s not possible to locate it more definitely than to say that the one- to three-seriate disposition of its pits would place it in a posi- tion equivalent to that occupied by Araucaria Cunninghamii, and therefore about three fourths of the way down the scale for that senus. This fact points with much force to the idea that of the two genera Dammara is of relatively lower 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 Penhallow, D. P. (David Pearce), 1854-1910. Boston : Ginn & Co.
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