. Botany for high schools and colleges. Botany. FlG. 263. Via. 264. FiQ. 265. Pig. —Portion of a leaf of Oleicli&rUa, with a £orus, a; 5, a sporangium.—Af- ter Hooker. Fig. 264.—Portion of a leaf of Trichomanen^ a, with five gori; 6, a sporangium.— After Hooker. Fig. 265.—Vertical section of a sorus, a, of Alsophila^ showing the cylindrical re- ceptacle ; b, a sporangium.—^After Hooker. inent (Figs. 2576 to 261). Genera fifty (Aerostielium, Polypodium, Adiantum, Pteris, Asplenium, Scolopendrium, Aspidium, Oystopteris, etc.); species 2000, widely distributed throughout the world. 5. Os
. Botany for high schools and colleges. Botany. FlG. 263. Via. 264. FiQ. 265. Pig. —Portion of a leaf of Oleicli&rUa, with a £orus, a; 5, a sporangium.—Af- ter Hooker. Fig. 264.—Portion of a leaf of Trichomanen^ a, with five gori; 6, a sporangium.— After Hooker. Fig. 265.—Vertical section of a sorus, a, of Alsophila^ showing the cylindrical re- ceptacle ; b, a sporangium.—^After Hooker. inent (Figs. 2576 to 261). Genera fifty (Aerostielium, Polypodium, Adiantum, Pteris, Asplenium, Scolopendrium, Aspidium, Oystopteris, etc.); species 2000, widely distributed throughout the world. 5. Osmundacem.—Sporangia stalked, splitting vertically, furnished with only a faint horizontal bar, instead of a ring (Fig. 266). Genera two {Osmunda and Todc a); species ten to twelve, widely distributed in north and south temperate re- gions. 6. Sch 'zceacem. — Sporan- gia sessile, splitting vertical- ly, crowned by a complete small annular horizontal ring (Fig. 267). Genera five (Sehizma, 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 (Cyathea medidlaris) 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. m Fig. 266. Fig. 267. Fig, 266. —Two sporangia I'f Osmunda; a. with the rudimentary ring pcen in front view ; b, with the ring seen in iirciflle.—After Hooker. Fig. 267.—Lower port,ion of a fertile iiinna, a, of Schiscea ; 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, C
Size: 2524px × 990px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1880, booksubjectbotany, bookyear1885
