. Elements of geology : a text-book for colleges and for the general reader. Geology. Fig. 506.—Ideal Section of a Sigillaria-Stem: a, pith; b, woody cylinder; c, inner bark; d, rind; e, bases of leaves; /, vascular thread running to the leaves; g, medullary Fig. 507.—Cross-Section of Stem of Cycas. ance with Lycopods. So thoroughly are they a connecting type that some paleontological botanists (Dawson) regard them as Cycads with strong Lycopod affinities, while most regard them as Lycopods with strong Cycad affinities. Recent investigations seem to substantiate the latter view; for, in
. Elements of geology : a text-book for colleges and for the general reader. Geology. Fig. 506.—Ideal Section of a Sigillaria-Stem: a, pith; b, woody cylinder; c, inner bark; d, rind; e, bases of leaves; /, vascular thread running to the leaves; g, medullary Fig. 507.—Cross-Section of Stem of Cycas. ance with Lycopods. So thoroughly are they a connecting type that some paleontological botanists (Dawson) regard them as Cycads with strong Lycopod affinities, while most regard them as Lycopods with strong Cycad affinities. Recent investigations seem to substantiate the latter view; for, in connection with Sigillaria, inflorescence similar to that of Lepidodendrons, and containing spores, have been at last found.* 5. Calamites.—These are plants having long, slender, tapering, reed- * Annales des Sciences Botarriques, vol. xix, p. 256, 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 LeConte, Joseph, 1823-1901. New York : D. Appleton and Co.
Size: 1773px × 1409px
Photo credit: © Paul Fearn / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1890, booksubjectgeology, bookyear1892
