The pictorial sketch-book of Pennsylvania : or, its scenery, internal improvements, resources, and agriculture, popularly described . hem another genus, termed caidopteris. ANTHRACITE COAL FORMATION 129 which he considers true stems of tree-ferns. These are hollow, butthe markings which they exhibit present so close a resemblance toexisting tree-ferns as to leave no doubt of their identity with thoseplants. They are, however, comparatively rare in the coal; while ofthe true Sigillaria, over forty species have been discovered. We ap-pend a figure of the fossil stem, caulopteris, 10, and a figur
The pictorial sketch-book of Pennsylvania : or, its scenery, internal improvements, resources, and agriculture, popularly described . hem another genus, termed caidopteris. ANTHRACITE COAL FORMATION 129 which he considers true stems of tree-ferns. These are hollow, butthe markings which they exhibit present so close a resemblance toexisting tree-ferns as to leave no doubt of their identity with thoseplants. They are, however, comparatively rare in the coal; while ofthe true Sigillaria, over forty species have been discovered. We ap-pend a figure of the fossil stem, caulopteris, 10, and a figure of anexisting tree-fern, 11, in juxtaposition for comparison. The family of Lepidodendra have, by some writers, been supposedto belong to that of the club-mosses ; while the larger species wereregarded as forming a transition to the coniferous plants. The livingspecies of their supposed analogues, fig. 12, abound in tropical cli-mates ;—they generally creep on the ground, some grow erect, butnone exceed three feet in height; whereas, fossil specimens have beenfound over thirty feet high, while fragments have been discovered.
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Keywords: ., bookcentury1800, bookdecade, booksubjectminesandmineralresources
