. Plant life, considered with special references to form and function. Plant physiology. VEGETATIVE TEPTOD UC'TWiY. 261 from spores until the mossworts are readied, in wliicli llic alternation of phase is well marked. In their simplest form such buds consist of a single cell, though more commonly they are two- to several-celled. Some or all of their cells are in the embr^•onic stage (^[ 256J. Like spores, they are sup- plied with reser\'e food. 362. Simple forms.—The form of brood buds is \arious. "\^'hen not dilTerentiated into distinct organs, they are club- shaped, lenticular, or spher
. Plant life, considered with special references to form and function. Plant physiology. VEGETATIVE TEPTOD UC'TWiY. 261 from spores until the mossworts are readied, in wliicli llic alternation of phase is well marked. In their simplest form such buds consist of a single cell, though more commonly they are two- to several-celled. Some or all of their cells are in the embr^•onic stage (^[ 256J. Like spores, they are sup- plied with reser\'e food. 362. Simple forms.—The form of brood buds is \arious. "\^'hen not dilTerentiated into distinct organs, they are club- shaped, lenticular, or spherical. In some thalloid li\er\vorts {jMarchantia and Lunuldriii) they are produced on the surface of the thallus, surrounded wholly or on one side by an out- growth from the surface forming a cup or a crescentic ledge (figs. 59, 290, 291). In some mosses brood buds arise from. P"iG. 290,—Thallus of INTarchantia, seen from above, showing the caps containing brood buds. See tig. 291. Natural size.—After Kerner. the ape.\ of the stem, either in cup-like clusters of lea\es or exposed (A, A', fig. 292'); in others they are smaller and simpler and are de^"eloped upjon the leaves (j9, B', fig. 292). In all the mossworts they belong to the gametophvte. 363. Shoots.—In fernworts and seed plants the brood buds belong to the spiorophyte. In the latter they are especially abundant, and often reach considerable size and complexity before being separated from the parent, nsualh- consisting of a short axis with a growing point and at least rudimentary. 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 Barnes, Charles Reid, 1858-1910. New York, H. Holt & company
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