. Fossil plants : for students of botany and geology . Paleobotany. 508 PTERIDOSPEBMS, ETC. [CH. South Africa, and elsewhere. It has been recognised also by Amalitzkyi in Upper Permian beds in Russia and by Zeiller in the Rhaetic series of Tonkin^. Glossopteris angustifolia, Brongniart. Figs. 340, B; 342. It is convenient to retain this designation for linear fronds with an acute or obtuse apex and a venation-reticulum composed of long and narrow meshes (fig. 340, B). It is by no means unlikely, as Arber suggests, that the same plant may have produced leaves of the Q. indica type and narrower
. Fossil plants : for students of botany and geology . Paleobotany. 508 PTERIDOSPEBMS, ETC. [CH. South Africa, and elsewhere. It has been recognised also by Amalitzkyi in Upper Permian beds in Russia and by Zeiller in the Rhaetic series of Tonkin^. Glossopteris angustifolia, Brongniart. Figs. 340, B; 342. It is convenient to retain this designation for linear fronds with an acute or obtuse apex and a venation-reticulum composed of long and narrow meshes (fig. 340, B). It is by no means unlikely, as Arber suggests, that the same plant may have produced leaves of the Q. indica type and narrower fronds which conform to 0. angustifolia. In his description of some. Fie. 342. Glossopteris angustifolia var. taeniopteroides. ( x 3^.) Indian specimens of G. indica, Zeiller draws attention to the variation exhibited in regard to the extent of anastomosing between the secondary veins: some examples with very few cross-connexions agree more closely with Taeniopteris than with Glossopteris as usually defined*. The venation shown in fig. 342 illustrates an extreme case of what is almost certainly a Glossopteris leaf of the G. angustifolia type. This specimen, which was discovered by Mr Leslie in the Permo-Carboniferous sandstone of Vereeniging (Transvaal), has been referred to a variety of Brongniart's species as G. angustifolia var. taeniopte- roides* on account of the almost complete absence of any cross- connexions. The reference to Glossopteris, which my friend 1 Amalitzky (01). 8 Zeiller (02). 2 Zeiller (03) PI. xvi. * Seward and Leslie (08) p. 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: 2169px × 1152px
Photo credit: © Central Historic Books / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1890, bookpublishercambr, bookyear1898
