. Botany, an elementary text for schools. Botany. STErCTURE OF FEKXS 173. indusium. Tliis indusium separates from the frond at its ed<jes, and the sporangia are exposed. Not all ferns have indnsia. The polypode (Figs. 306, 307) does not: the sori are naked. In the brake (Fig. 308) and maiden-hair (Fig. 309) the edge of the frond turns over and forms an indusium. In some ferns (Fig. 310) an entire frond becomes contracted to cover the sporangia. In other cases the indusium is a sac-like cov- ering, which splits (Fig. 311). 319. The sporangium or spore- case of a fern is a more or less 111 IT
. Botany, an elementary text for schools. Botany. STErCTURE OF FEKXS 173. indusium. Tliis indusium separates from the frond at its ed<jes, and the sporangia are exposed. Not all ferns have indnsia. The polypode (Figs. 306, 307) does not: the sori are naked. In the brake (Fig. 308) and maiden-hair (Fig. 309) the edge of the frond turns over and forms an indusium. In some ferns (Fig. 310) an entire frond becomes contracted to cover the sporangia. In other cases the indusium is a sac-like cov- ering, which splits (Fig. 311). 319. The sporangium or spore- case of a fern is a more or less 111 IT 1 II •,! 305. FruitiiiK froiiU of Clirist- globular body and usually with a ,„,,« son at «. Om- stalk (Fig. :!()7). // ru„f"rus« spoyrs. When ripe it bursts and the spores are set free. L;iy a mature I'niitiiig IVond (»f any I'cni on white paper, top side up, and allow it to remain in a dry, warm place. The spoi-es will discharge on the paper. 320. In a moist, warm pla, or. 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 Bailey, L. H. (Liberty Hyde), 1858-1954. New York Macmillan
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Keywords: ., bookauthorbai, bookcentury1900, bookdecade1900, booksubjectbotany
