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 470 FERNS—LEPIDODENDRON. [Ch. XXIV been referred to this genus. They consist of cylindrical stems or trunks, covered with leaf-scars. In their mode of branching, they are always dichotomous (see fig. 518). They are considered by Brongniart and Hooker to belong to the Lycopodiacece, plants of this family bearing cones, with similar sporangia and spores (fig. 521). Most of them grew to the size of large trees. The fig
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 470 FERNS—LEPIDODENDRON. [Ch. XXIV been referred to this genus. They consist of cylindrical stems or trunks, covered with leaf-scars. In their mode of branching, they are always dichotomous (see fig. 518). They are considered by Brongniart and Hooker to belong to the Lycopodiacece, plants of this family bearing cones, with similar sporangia and spores (fig. 521). Most of them grew to the size of large trees. The figs. 517-519 Tig. 517. Fig. 518. Lepidodendron Sternoergii. Coal-measures, near Newcastle. Fig. 517. Branching trunk, 49 feet long, supposed to have belonged to L. Sterribergii. (Foss. Flo., 203.) Fig. 518. Branching stem with bark and leaves of L. Stembergii. (Foss. Flo., 4.) Fig. 519. Portion of same nearer the root; natural size. (Ibid.) represent a fossil Lepidodendron, 49 feet long, found in Jarrow Col- liery, near Newcastle, lying in shale parallel to the planes of stratifica- tion. Fragments of others, found in the same shale, indicate, by the size of the rhomboidal scars which cover them, a still greater magni- tude. The living club-mosses, of which there are about 200 species, are most abundant in tropical climates. They usually creep on the ground, but some stand erect, as the Lycopodium densum from New Zealand (fig. 520), which attains a height of 3 feet. Fig. 520.
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