. Elements of geology : a text-book for colleges and for the general reader. Geology. PLAXTS OF THE COAL. 363 The next three orders we will discuss more fully for two reasons: First, the Conifers were probably mostly highland plants, and only found their way into the coal-swamps by accident, being in fact brought down by freshets. The Ferns formed the thick underbrush of the coal- swamps. Neither of these contributed a very large share to the mate- rial of the coal-seams. The great trees of the coal-swamps, and which formed the larger part of the material preserved as coal, were Lepido- dendri
. Elements of geology : a text-book for colleges and for the general reader. Geology. PLAXTS OF THE COAL. 363 The next three orders we will discuss more fully for two reasons: First, the Conifers were probably mostly highland plants, and only found their way into the coal-swamps by accident, being in fact brought down by freshets. The Ferns formed the thick underbrush of the coal- swamps. Neither of these contributed a very large share to the mate- rial of the coal-seams. The great trees of the coal-swamps, and which formed the larger part of the material preserved as coal, were Lepido- dendrids, Sigillarids, and Catamites. Again, the Conifers and Ferns were unmistakably Conifers and Ferns, though certainly with characters connecting with other orders and classes; but the three orders now about to be discussed combine so. Fig. 473 Fig. 474. Figs. 472-476.—Coal-Ferns: 472. Callipteris Sullivanti (after Lesquereux). 473. Pecopteris Strongii (after Lesquereux). 474. Alethopteris Massilonis (after Lesquereux). 475. Same enlarged to 476. Xeuropteris flexuosa (after Brongniart). show dichotornous venation. completely the characters of widely-separated classes that there is still some doubt as to their real place. For that very reason, however, they are peculiarly interesting to the 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 LeConte, Joseph, 1823-1901. New York : D. Appleton and Co.
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