. Fossil plants : for students of botany and geology . Paleobotany. xxx] NETJBOPTERIS 111 B. Neuropteris gigantea, etc. Potoniea, Zeiller. In 1899 Zeiller^ instituted the name Potoniea for some peculiar fertile leaves found in the Coal Measures of Heraclea consisting of a branched axis with cuneate segments, 7â10 x 6â8 mm., bearing numerous fusiform bodies, 1â1-5 mm. long, at the upper edge (fig. 421, A). These marginal bodies he regarded as sporangia A &. Tig. 421. A. Potoniea adiantiformis Zeill. (very slightly enlarged). B. Miorosporangia of Potoniea (enlarged). C. Linopteris obligua; s
. Fossil plants : for students of botany and geology . Paleobotany. xxx] NETJBOPTERIS 111 B. Neuropteris gigantea, etc. Potoniea, Zeiller. In 1899 Zeiller^ instituted the name Potoniea for some peculiar fertile leaves found in the Coal Measures of Heraclea consisting of a branched axis with cuneate segments, 7â10 x 6â8 mm., bearing numerous fusiform bodies, 1â1-5 mm. long, at the upper edge (fig. 421, A). These marginal bodies he regarded as sporangia A &. Tig. 421. A. Potoniea adiantiformis Zeill. (very slightly enlarged). B. Miorosporangia of Potoniea (enlarged). C. Linopteris obligua; side-Tiew of mlorosporophyU. D. Newopteria heterophylla, pinnules and miorosporangia (?). E. Linopteris obliqua, surface-view of miorosporophyll. (A, C, E, after P. Bertrand; B, after Carpentier; D, after Kidston.) and expressed the opinion that Potoniea may be the fructification â of some form of Neuropteris, Mariopteris or Alethopteris. Car- pentier^ afterwards described similar though rather larger examples ' ZeiUer (99) B. p. 52, PI. iv. fig. 19. ^ Carpentier (11) p. 12, Pis xvi. 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
Size: 1487px × 1680px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1890, bookpublishercambr, bookyear1898
