. Fossil plants : for students of botany and geology . Paleobotany. xxi] CYATHEACEAE 369 mens of fronds which afford no evidence as to the nature of the sori or sporangia. Some of the fronds referred by this author to Thyrsopteris rarinervis'^, which I examined in the Washington Museum, are in all probability examples of Onychiopsis, a, genus included in the Polypodiaceae. The fragments described by Lester Ward^ as species of Thyrsopteris from the Lower Cretaceous of the Black Hills of North America afford no. Fig. 272. Coniopteris hijmeiiophylloides. Specimen from the Inferior Oolite, Scarbor
. Fossil plants : for students of botany and geology . Paleobotany. xxi] CYATHEACEAE 369 mens of fronds which afford no evidence as to the nature of the sori or sporangia. Some of the fronds referred by this author to Thyrsopteris rarinervis'^, which I examined in the Washington Museum, are in all probability examples of Onychiopsis, a, genus included in the Polypodiaceae. The fragments described by Lester Ward^ as species of Thyrsopteris from the Lower Cretaceous of the Black Hills of North America afford no. Fig. 272. Coniopteris hijmeiiophylloides. Specimen from the Inferior Oolite, Scarborough; in the York Museum. [] satisfactory evidence of relationship to the recent type. Similarly Velenovsky has described a Lower Cretaceous Onychiopsis from Bohemia^ as a .species of Thyrsopteris, although the fertile segments bear little or no resemblance to those of the Cyathe- aceous genus. Some fertile portions of fronds described by Heer* as Asplenium Johnstrupi and afterwards as Dicksonia • Fontaine (89) p. 123, Pis. xxvi. xliii. etc. - Ward (99) P!. clxi. 3 Velenovsky (88). -* Heer (75) A. PI. i. figs. 6, 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: 1540px × 1622px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1890, bookpublishercambr, bookyear1898
