Text-book of structural and physiological botany . FiG. 545. —Stem of Cycadoidea 77ze^alophylla(Cycadeae), from Portland Fig. 546. — Branch ofPresleamnn (Cycadeae). 428 Structural and Physiological Botany, The uniformity of vegetation characteristic of the Carbo-niferous is still more marked in the Triassic system. Next in succession above the Trias is the Jurassic sys-tem^ which again is divided into three sections, the Lias^ andthe Lowei: and Upper Oolite. The fossil remains found in thisformation lead to the conclusion that the marine plants ofthe Lias did not differ essentially from
Text-book of structural and physiological botany . FiG. 545. —Stem of Cycadoidea 77ze^alophylla(Cycadeae), from Portland Fig. 546. — Branch ofPresleamnn (Cycadeae). 428 Structural and Physiological Botany, The uniformity of vegetation characteristic of the Carbo-niferous is still more marked in the Triassic system. Next in succession above the Trias is the Jurassic sys-tem^ which again is divided into three sections, the Lias^ andthe Lowei: and Upper Oolite. The fossil remains found in thisformation lead to the conclusion that the marine plants ofthe Lias did not differ essentially from those of the presenttime in their external appearance, although the species been very dissimilar. The case is different with theterrestrial vegetation, in which we still find a considerablecoincidence with that of the Keuper. The prevalent formsin the forests consisted of Cycadeae, of which fifty-eightspecies have been described. From this point, this beau-tiful form of vegetation, w^hich in regard both to its habitand to its morphological and anatomical structure occupiesan intermediate position between the F
Size: 960px × 2603px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1870, bookpublishernewyorkjwileysons
