. Catalogue of the Mesozoic plants in the Department of Geology, British Museum (Natural History) [Part I-II] The Wealden flora. Paleobotany; Paleobotany. dicttophtlltjm: 141 acutilobum,^ Schent, in its Yenation and the arrangement of the sori. A similar regular disposition of sporangia is shown in Heer's Lower Cretaceous species from Greenland, B. Bioksmi,^ Fig. 16 (V. 21775). Dictyophyllmn Roemeri. Twice natural size. V. 2177*. Fig. 16. A small piece of a frond showing portions of three chief veins and, between them, a reticulum of smaller veins. In the meshes of the finer veins there o
. Catalogue of the Mesozoic plants in the Department of Geology, British Museum (Natural History) [Part I-II] The Wealden flora. Paleobotany; Paleobotany. dicttophtlltjm: 141 acutilobum,^ Schent, in its Yenation and the arrangement of the sori. A similar regular disposition of sporangia is shown in Heer's Lower Cretaceous species from Greenland, B. Bioksmi,^ Fig. 16 (V. 21775). Dictyophyllmn Roemeri. Twice natural size. V. 2177*. Fig. 16. A small piece of a frond showing portions of three chief veins and, between them, a reticulum of smaller veins. In the meshes of the finer veins there occur small depressions which probably represent sporangia; here and there these appear to have a fairly- regular arrangement. Cf. Diotyophyllum Dichoni, Heer, Fl. foss. Arct. vol. iii. pi. iii. figs. 9 and 95, 9c and 9d. In this specimen the finer reticulation is not nearly so apparent as in Schenk's figure, but, in the absence of more satisfactory evidence, I prefer to adopt his specific name, although possibly more perfect material may show that the English specimens belong to a separate species. Cf. also some of the figures of JETausmannia Forchhammeri, Earth., pi. xi. figs. 4 and 4a.' Ecclesbourne. Eufford Coll. V. 2177. A similar fragment to V. 21775. Traces of sporangial depressions in some of the meshes. Fig. 17 (V. 2177a). Dictyophyllum Soemeri. Twice natural size. V. 2177a. Fig. 17. Small piece of leaf showing the venation very clearly, as a carbonaceous reticulum. Ecclesbourne. Eufford Coll. ' Fl. fos8. Grenz. Keup. Lias, pi. xx. • Flor. foss. Arct. vol. iii. pi. iii. fig. 9. ' Bartholui, loe. 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 British Museum (Natural History). Dept. of Geology; Seward, A. C. (Albert Charles), 1863-1941. London. Printed by order of the Trustees
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