. Botany for high schools and colleges. Botany. Fig. 263. Fio. 264. Fig. 265. Fig. 263.—Portion of a leaf of Gleich&nia^ with a sorus, a; 6, a sporangium.—Af- ter Hoolce]-. Fig. 264.—Portion of a leaf of Trichomanen^ a, with iive sori; 6, a sporangium.— After Hooker. Fig. 265.—Vertical section of a sorus, a, of AlsophUa, showing the cylindrical re- ceptacle ; 6, a sporangium.—After Hooker. inent (Figs. 3576 to 361). Genera fifty (Acrostichum, Polypodium, Adiantum, Pteris, AspUnium, SeolopewJrium, Aspidnm, Cysiopteris, etc.); species 3000, widely distributed throughout the world. 5. Osmunda
. Botany for high schools and colleges. Botany. Fig. 263. Fio. 264. Fig. 265. Fig. 263.—Portion of a leaf of Gleich&nia^ with a sorus, a; 6, a sporangium.—Af- ter Hoolce]-. Fig. 264.—Portion of a leaf of Trichomanen^ a, with iive sori; 6, a sporangium.— After Hooker. Fig. 265.—Vertical section of a sorus, a, of AlsophUa, showing the cylindrical re- ceptacle ; 6, a sporangium.—After Hooker. inent (Figs. 3576 to 361). Genera fifty (Acrostichum, Polypodium, Adiantum, Pteris, AspUnium, SeolopewJrium, Aspidnm, Cysiopteris, etc.); species 3000, widely distributed throughout the world. 5. OsmundaeecB.—Sporangia stalked, splitting vertically, furnished with only a faint liorizontal 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. SchizmaceCB. — Sporan- gia sessile, splitting vertical- ly, crowned by a complete small annular horizontal ring <Fig. 367). Genera five {ScMzma, Anemia, Lygodiwm, 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 (Cyathea meduUaris) 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. 266. Fig. 366. —Two Fib. 267. sporangia of Osmunda; with the rudimentary ring peen in front view ; J, with the ring seen in profile.—After Hooker. Fig. 267.—Lower portion of a fertile i inna. a, of Schizma; 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 E. (Charl
Size: 2521px × 991px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1880, booksubjectbotany, bookyear1888
