. Our native ferns and their allies; with synoptical descriptions of the American Pteridophyta north of Mexico. Ferns; Pteridophyta. 34 OUR NATIVE FERNS AND THEIR ALLIES. LITERATURE. Baker (J. G.). Fern Allies, pp. i-6 (1887). Braun (Alexander). A Monography of the North American Species of the Genus Equisetum. With additions by George Engelmann, In Sillimari's Journal, XLVi, 81-91 (1843). Describes the then known North American species of Equisetum. Campbell (Douglas H.). The Development of the Male Prothallium of the Field Horse-tail. In American Naturalist, XVI, i-io (Jan. 1883). MiLDE
. Our native ferns and their allies; with synoptical descriptions of the American Pteridophyta north of Mexico. Ferns; Pteridophyta. 34 OUR NATIVE FERNS AND THEIR ALLIES. LITERATURE. Baker (J. G.). Fern Allies, pp. i-6 (1887). Braun (Alexander). A Monography of the North American Species of the Genus Equisetum. With additions by George Engelmann, In Sillimari's Journal, XLVi, 81-91 (1843). Describes the then known North American species of Equisetum. Campbell (Douglas H.). The Development of the Male Prothallium of the Field Horse-tail. In American Naturalist, XVI, i-io (Jan. 1883). MiLDE (J.). Monographia Equisetorum. 4to, pp. 607, with 35 plates. Dresden (1865). Newcombe (F. C). Spore dissemination in Equisetum. In Botanical Gazette, xiii, 173-178 (iJ C THE CLUB-MOSSES. 92. General Characters.—The club-mosses are chiefly small perennial plants usually growing in dry or moist woods, or even on exposed rocks with little soil for nourish- ment. Most of the species are somewhat moss-like in habit, as might be suspected from the popular names given to these plants, the genus Lycopodium taking the name of club-moss and Selaginella that of rock- moss. Various species of Lycopodium are also known as ground-pine, ground-fir, ground-cedar, running-pine, etc., from more or less marked resemblances (Fig. 23). In the curious Sela-. ginella lepidophylla from Fig. 23.—Portion olLycopodium clavaium L. . , ,. , % natural size. (After Prantl.) Arizona the branches of the closely coiled central stem roll up when dry into a nest-like ball, and when moistened expand so as to appear flat or saucer-. 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 Underwood, Lucien Marcus, 1853-1907. New York, H. Holt
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