. The pictorial sketch-book of Pennsylvania, or, Its scenery, internal improvements, resources, and agriculture, populary described . Fia. 7.—PTEEOPHYLLUM. FIG. S.—ASTERAPHYLLITES. donous plants found in the coal, but unlike the other, the stems onlyare known. There is a variety of others which it is probably un-necessary to specify—the examples already afforded being, we think,quite sufficient to convey an idea of the several families comprisingthe coal vegetation. Of the numerous families composing the classof monocotyledonous plants, there are comparatively few to be foundin the coal format
. The pictorial sketch-book of Pennsylvania, or, Its scenery, internal improvements, resources, and agriculture, populary described . Fia. 7.—PTEEOPHYLLUM. FIG. S.—ASTERAPHYLLITES. donous plants found in the coal, but unlike the other, the stems onlyare known. There is a variety of others which it is probably un-necessary to specify—the examples already afforded being, we think,quite sufficient to convey an idea of the several families comprisingthe coal vegetation. Of the numerous families composing the classof monocotyledonous plants, there are comparatively few to be foundin the coal formation. The class of dicotyledonous, however, pre-sents a greater variety and number, most of which belong to the family. FIG. 0.— of Sigillaria, of which fig. 9 affords a specimen. The Sigillaria is oneof the most important plants of the coal, and probably furnished avery large amount of its vegetable matter. The stem is conical, and 128 OFF-HAND SKETCHES, deeply furrowed, with scars between the furrows in rows, but not-arranged in a distinctly spiral manner. There are some forty speciesin the coal formation. The most common of the coal-plants may be classified as follows :first, ferns and Sigillaria. Second, lepidodendron, a doubtful genus,variously associated by botanists. Thirdly, calamltes. Fourthly,coniferous plants; and fifthly, stigmaria, which is probably an ex-tinct family. To ascertain more satisfactorily the nature and cir-cumstances attending the growth of the vegetable matter, it is neces-sary to institute some further inquiries. Thus, by comparisons withexisting species, and the elements constituting their growth, we obtainconsiderable light on the subject, and are able to fo
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Keywords: ., bookcentury1800, bookdecade, booksubjectminesandmineralresources
