. Botany for high schools and colleges. Botany. FiG. 263. Fig. 264. Fig. 265. Fig. 263.—Portion of a leaf of Gleich&nia, with a sorus, a ; b, a sporangium.—Af- ter Hooker. Fig. 264.—Portion of a leaf of Trichoinanes, a, with five sori; b, a sporangium.— Aftf r Hooker. Fig. 265.—Vertical section of a sorus, a, of Alsophila, showing the cylindrical re- ceptacle ; 5, a sporangium.—After Hooker. inent (Figs. 257& to 261). Genera fifty (Acrostichum, Polypodium, Adiantum, Pteris, A,splenium, Scolopendriu7n, Aspidrim, Cysiopteris, etc.); species 2000, widely distributed throughout the world,
. Botany for high schools and colleges. Botany. FiG. 263. Fig. 264. Fig. 265. Fig. 263.—Portion of a leaf of Gleich&nia, with a sorus, a ; b, a sporangium.—Af- ter Hooker. Fig. 264.—Portion of a leaf of Trichoinanes, a, with five sori; b, a sporangium.— Aftf r Hooker. Fig. 265.—Vertical section of a sorus, a, of Alsophila, showing the cylindrical re- ceptacle ; 5, a sporangium.—After Hooker. inent (Figs. 257& to 261). Genera fifty (Acrostichum, Polypodium, Adiantum, Pteris, A,splenium, Scolopendriu7n, Aspidrim, Cysiopteris, etc.); species 2000, widely distributed throughout the world, 5. OsmundacecB.—Sporangia stalked, splitting vertically, furnished with only a faint horizontal bar, instead of a ring (Fig. 266). Genera two {Osmunda and Todea); species ten to twelve, widely distributed in north and south temperate re- gions. 6. Schizceacece. — Sporan- gia sessile, splitting vertical- ly, crowned by a complete small annular horizontal ring (Fig. 267). Genera five {ScMzcea, Anemia, Lygodium, etc.); species sixty, mostly natives of the warm regions of America and Asia, Economically the true Ferns are of comparatively little value. The pulpy interior of the stem of a tree-fern {Cyatliea medullaris) growing in the Pacific islands furnishes an important article of food to the natives. In Australia the underground stems of Pteris aquilina supply an indifferent food. A few species are of doubtful value as astringent medicines. The long woolly hairs of certain species ot. Fig. 267. Fig. 266.—'Two sporangia of Osmunda; a, with the rudimentary ring peen in front view ; b, with the ring seen in profile.—After Hooker. Fig. 267.—Lower portion of a fertile iiinna, a, of ScMzcea ; b, a sporangium.—After 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 Bessey, Charles Edwin
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