. Fossil plants : for students of botany and geology . Paleobotany. xxi] CLADOPHLEBIS 345 sents an impression from the Inferior Oolite rocks of the Yorkshire coast in which the exposed upper surface of the pinnules shows a series of parallel ridges following the course of the lateral veins and no doubt formed by oblong son on the lower surface. There can be little doubt that the specimen figured by Lindley and Hutton and by others as Pecopteris undans^ is, as Nathorst suggests, a portion of a fertile frond of C. denticulata. A fertile specimen of a frond resembling in habit C. denticulata, whi
. Fossil plants : for students of botany and geology . Paleobotany. xxi] CLADOPHLEBIS 345 sents an impression from the Inferior Oolite rocks of the Yorkshire coast in which the exposed upper surface of the pinnules shows a series of parallel ridges following the course of the lateral veins and no doubt formed by oblong son on the lower surface. There can be little doubt that the specimen figured by Lindley and Hutton and by others as Pecopteris undans^ is, as Nathorst suggests, a portion of a fertile frond of C. denticulata. A fertile specimen of a frond resembling in habit C. denticulata, which Fontaine has described from the. Fio. 258. Fertile pinnae of Cladophlehis denticulata. (From a Yorkshire specimen in the Sedgwick Museum, Cambridge.) Jurassic rocks of Oregon as Danaeopsis Storrsii^, exhibits, as that author points out, a superficial resemblance to the specimen named by Lindley and Hutton Pecopteris undans. There is, however, no adequate reason for referring the American fragment to the Marattiaceae. In the absence of sporangia we cannot speak confidently as to the systematic position of this common type; but there are fairly good grounds for the assertion that some at least of the fronds described under this name are those of Osmundaceae. The English spiecimen shown in 1 Lindley and Hutton (34) A. PI. cxx. - Fontaine, in Ward (05) PI. xv. 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
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