Elements of geology, or, The Elements of geology, or, The ancient changes of the earth and its inhabitants as illustrated by geological monuments elementsofgeolog00lyel Year: 1868 Surface of another individual of same species, showing form of tubercles. (Foss. Flo., 34.) SUgmarxa jicoides, Brong. $ nat. size. (Foss. Flo., 32). woody system much resembling that of Sigillaria, the structure of the vessels being, like it, scalariform. Coniferce.—The coniferous trees of this period are referred to five genera; the woody structure of some of them showing that they were allied to the Araucarian div
Elements of geology, or, The Elements of geology, or, The ancient changes of the earth and its inhabitants as illustrated by geological monuments elementsofgeolog00lyel Year: 1868 Surface of another individual of same species, showing form of tubercles. (Foss. Flo., 34.) SUgmarxa jicoides, Brong. $ nat. size. (Foss. Flo., 32). woody system much resembling that of Sigillaria, the structure of the vessels being, like it, scalariform. Coniferce.—The coniferous trees of this period are referred to five genera; the woody structure of some of them showing that they were allied to the Araucarian division of pines, more than to any of our common European firs. Some of their trunks exceeded 44 feet in height. Many, if not all of them, seem to have differed from living Coniferce in having large piths; for Professor Williamson has demon- strated the fossil of the coal-measures called Sternbergia to be the pith of these trees, or rather the cast of cavities formed by the shrinking Fig. 531. Fragment of coniferous wood, Dadoxylon, Endlicher, fractured longitudinally; from Coalbrook Dale. W. C. Williamson.* a. Bark, &. Woody zone or fibre (pleurenchyma). c. Medulla or pith. d. Cast of hollow pith, or ' '
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