. Fossil plants : for students of botany and geology . Paleobotany. 564 PTERIDOSPERMS, ETC. [CH. probably not generically identical with the Irish and Arctic species. The dichotomous branching of the rachis in A. Tscher- maki and A. Dawsoni is a feature unknown in Fio. 369. Arehaeopteris hibemica. Fertile pinna. Dublin Geological Survey Museum. (Keduced. After Kidston.) B. A. hibemica. Pinnule. (Slightly enlarged. After Carruthers.) C. A. hibemica. Base of petiole. (Dublin Museum. After Kidston.) D. A. archetypiis. Base of petiole: Ellesmere Land. (After Nathorst. J nat. size.)
. Fossil plants : for students of botany and geology . Paleobotany. 564 PTERIDOSPERMS, ETC. [CH. probably not generically identical with the Irish and Arctic species. The dichotomous branching of the rachis in A. Tscher- maki and A. Dawsoni is a feature unknown in Fio. 369. Arehaeopteris hibemica. Fertile pinna. Dublin Geological Survey Museum. (Keduced. After Kidston.) B. A. hibemica. Pinnule. (Slightly enlarged. After Carruthers.) C. A. hibemica. Base of petiole. (Dublin Museum. After Kidston.) D. A. archetypiis. Base of petiole: Ellesmere Land. (After Nathorst. J nat. size.) E. A. fissilis. Sporangia. (Slightly enlarged. After Schmal- hausen.) F. A. fissilis. Sterile pinnule. Ellesmere Land. (Slightly en- larged. After Nathorst.) G. Bear Island. (After Nathorst. f nat. size.) H. Arehaeopteris sp. size.) Ellesmere Land. (After Nathorst. J nat. In the absence of fertile pinnae the separation of Arehaeopteris from Rhacopteris is by no means 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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