. A textbook of botany for colleges and universities ... Botany. FiG. 981. — The basal portion of a shoot of the ditch stonecrop (Penthorum sedoides), showing the development of new rhizomes; note that the upper rhizomes (r, r') are more pronouncedly progeotropic than are the lower rhizomes (r"); i, scale Fig. 982. —An obliquely ascend- ing rhizome of Juncus balticus, illustrating the reaction of this species to sand submergence; *", scale leaves. — From Scholz. decayed portion of the rhizome; it is possible also to learn something of the life conditions of each season on ac
. A textbook of botany for colleges and universities ... Botany. FiG. 981. — The basal portion of a shoot of the ditch stonecrop (Penthorum sedoides), showing the development of new rhizomes; note that the upper rhizomes (r, r') are more pronouncedly progeotropic than are the lower rhizomes (r"); i, scale Fig. 982. —An obliquely ascend- ing rhizome of Juncus balticus, illustrating the reaction of this species to sand submergence; *", scale leaves. — From Scholz. decayed portion of the rhizome; it is possible also to learn something of the life conditions of each season on account of variations in the annual increment. More commonly the radiation and branching of rhizomes in all directions from the original center result when isolated in sym- metrical colonies of ever increasing circumference. Sometimes (as in the flags) the death of the older portions in the interior of such a colony results in the formation of a ring, comparable to the " fairy rings " of various fungi (p. 807), though continued branching is more likely to keep the entire space occupied (fig. 984). The role of rhizomes. — The rhizome habit, perhaps more than any other, facilitates the occupation of space by plants, especially because. 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 Coulter, John Merle, 1851-1928; Barnes, Charles Reid, 1858-1910, joint author; Cowles, Henry Chandler, 1869- joint author. New York, Cincinnati [etc] American book company
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