. Fossil plants : for students of botany and geology . Paleobotany. 46 OrNKGOALES [CH. referred this type to Schizopteris but Bunbury, while adopting Bean's MS. specific name, substituted the generic designation Baiera. The leaves are petiolate and the lamina is divided almost or quite to the base into a varying number of hnear segments with obtuse apices. The veins, frequently indistinct, run parallel to the edges of the lamina and there are several in each segment. Leaves identical with or very similar to Baiera gracilis are very widely distributed among Jurassic floras in both hemispheres.
. Fossil plants : for students of botany and geology . Paleobotany. 46 OrNKGOALES [CH. referred this type to Schizopteris but Bunbury, while adopting Bean's MS. specific name, substituted the generic designation Baiera. The leaves are petiolate and the lamina is divided almost or quite to the base into a varying number of hnear segments with obtuse apices. The veins, frequently indistinct, run parallel to the edges of the lamina and there are several in each segment. Leaves identical with or very similar to Baiera gracilis are very widely distributed among Jurassic floras in both hemispheres. Some of the specimens described by authors as Ginkgo lepida are hardly distinguishable from Bunbury's species; G. concinha^ Heer from the Siberian Jurassic flora is another very similar form; also Baiera incurvata Heer^ from the Lower Cretaceous of Green- land, B. angustiloba Heer*, as figured from Siberia and China, B. bidens ()* from Queensland, B. australis McCoy and B. delicatula Sew. from Jurassic rocks in Victoria^, also leaves recently referred by Halle ^ to B. australis from the Lower Cretaceous plant-beds of Patagonia. Baiera gracilis is recorded from Upper Jurassic (or Lower Cretaceous) beds in Alaska', but leaves of this. Fig. 651. Baiera gracilis forma Mucnsteriana. , (British Maseum, f nat. size.) M. S. type are rare in the Jurassic strata of North America. The Rhaetic species B. Mucnsteriana'^ (Presl) described by Schenk from Franconia and by other authors is a closely aUied type which 1 Heer (77) ii. PI. xm. figs. 6—8. = Ibd. (82) B. PI. xni. &s. 6. 3 lb d. (78) ii. PI. VII. fig. 2; Krassei () PI. n. fis. 10; Schenk'(83) A. PI. Lra. fig. 1. » Tenison-Woods () A. PI. iv. fig. 3. = Seward (04^) B. 36—38. 6 HaUe (13) Pis. iv., v. ' Fontaine in Ward (05) B. PI. xuv. fig. 2. « Schenk (67) A. PI. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration a
Size: 1801px × 1387px
Photo credit: © Central Historic Books / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1890, bookpublishercambr, bookyear1898
