. Fossil plants : for students of botany and geology . Paleobotany. 536 PTERIDOSPERMS, ETC. [CH. The main rachis gives off branches as in Mariopteris, but in Diplotmema each naked lateral branch is forked at its apex into two opposite pinnae bearing deeply dissected Sphenopteroid pinnules. Zeiller' and Stur have recorded fertile specimens of Diplotmema, but in no case have actual sporangia been h^. Fio. 355. A. Cephalotheca mirabilis, Nath. Fertile pinnae. (Partially re- stored. After Nathorst.) B. C. mirabilis. Sterile pinnule. Nat. size. (After Nathorst.) discovered. In the species Diplotmem
. Fossil plants : for students of botany and geology . Paleobotany. 536 PTERIDOSPERMS, ETC. [CH. The main rachis gives off branches as in Mariopteris, but in Diplotmema each naked lateral branch is forked at its apex into two opposite pinnae bearing deeply dissected Sphenopteroid pinnules. Zeiller' and Stur have recorded fertile specimens of Diplotmema, but in no case have actual sporangia been h^. Fio. 355. A. Cephalotheca mirabilis, Nath. Fertile pinnae. (Partially re- stored. After Nathorst.) B. C. mirabilis. Sterile pinnule. Nat. size. (After Nathorst.) discovered. In the species Diplotmema Zeilleri Stur (fig. 354, C, C) two Aphlebiae occur at the base of each secondary axis'-. It has been pointed out by Potonie that in Diplotmema furcatum the equal dichotomy of the lateral branches is not characteristic ' Zeiller (88) A. p. 147. " Ibid. PI. 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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