. Fossil plants : for students of botany and geology . Paleobotany. XVI] SIGILLARIA 225 The aerial shoots of this species are occasionally branched dichotomously\ the apical portions bearing short crowded leaves^; the surface of the bark is either completely covered with con- tiguous leaf-scars without definite leaf-cushions or with projecting cushions forming a narrow sloping surface surrounding each. Fig. 203. Sigillaria Brardi Brongn. (J nat. size). From a photograph of a specimen in Dr Kidston's collection, from the Upper Transition Series of Staffordshire. Published by Kidston (02) PI. li
. Fossil plants : for students of botany and geology . Paleobotany. XVI] SIGILLARIA 225 The aerial shoots of this species are occasionally branched dichotomously\ the apical portions bearing short crowded leaves^; the surface of the bark is either completely covered with con- tiguous leaf-scars without definite leaf-cushions or with projecting cushions forming a narrow sloping surface surrounding each. Fig. 203. Sigillaria Brardi Brongn. (J nat. size). From a photograph of a specimen in Dr Kidston's collection, from the Upper Transition Series of Staffordshire. Published by Kidston (02) PI. lix. fig. 1. leaf-scar. Other parts of the plant may possess cushions similar in their kite-shaped form to those of Lepidodendron, but without a median vertical groove, or the leaf-scars may be spirally disposed at varying distances apart on a comparatively smooth and longi- tudinally wrinkled bark. The species exhibits striking instances of a transition between the Favularian, Clathrarian, and Leioder- marian forms of stems. The leaf-scars, which are hexagonal in 1 Renault (96) A. PI. xxxv.; ZeiUer (06) PI. xlii. ^ Grand'Eury (90) 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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Keywords: ., bookcentury1800, bookdecade1890, bookpublishercambr, bookyear1898
