. Studies in fossil botany . Paleobotany. 256 STUDIES IN FOSSIL BOTANY Stigmaria, differing in certain respects from the specimens grouped under Stigmaria ficoides. Xenophyton radiculosum, a fossil described by Mr. T. Hick in 1891,1 has been shown by Professor F. E. Weiss, in agreement with a suggestion of Williamson's, to be a Stigmaria. The pith and the whole of the cortex are preserved, giving the specimen a very different char- acter from that of the ordinary S. ficoides. The wood,. Fig. 105.—Stigmaria ficoides. Transverse section of rootlet, showing dichotomy. The outer cortex, differenti
. Studies in fossil botany . Paleobotany. 256 STUDIES IN FOSSIL BOTANY Stigmaria, differing in certain respects from the specimens grouped under Stigmaria ficoides. Xenophyton radiculosum, a fossil described by Mr. T. Hick in 1891,1 has been shown by Professor F. E. Weiss, in agreement with a suggestion of Williamson's, to be a Stigmaria. The pith and the whole of the cortex are preserved, giving the specimen a very different char- acter from that of the ordinary S. ficoides. The wood,. Fig. 105.—Stigmaria ficoides. Transverse section of rootlet, showing dichotomy. The outer cortex, differentiated into two zones, is still continuous, while the inner cortex of the two branches has completely divided, , the two monarch vascular bundles. X 23. S. Coll. 172. (G. T. G.) which is little developed, appears to be wholly centri- fugal, as in that species. The rootlet-bundles take a steeply acropetal course, like leaf-traces, and secondary parenchyma is formed about them in passing through the middle cortex, which has a similar structure to that of Lepidophloios fuliginosus, the plant to which Professor Weiss believes this Stigmaria to have belonged. Within the periderm there are strands of secretory cells, as in so many Lepidodendroid stems. It was in a 1 Hick, "On a New Fossil Plant from the Lower Coal-measures," Journal Linnean Society, vol. xxix. 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 Scott, Dukinfield Henry, 1854-1934. London, A. and C. Black
Size: 1987px × 1257px
Photo credit: © Central Historic Books / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, bookpublisherlondonaandcblack
