. Carnegie Institution of Washington publication. 102 THE ECOLOGICAL RELATIONS OF ROOTS. the rhizomes arise great clusters of fibrous roots from 3 to 4 mm. to only mm. in diameter. While many of these run rather vertically downward, so that some of the longer ones reach depths of 40 inches, others spread laterally to a distance of 14 to 18 inches and reach depths of only 4 to 12 inches. Thus the soil for a distance of more than a foot on either side of the plant and to a depth of 2 or 3 feet i? well supplied with these fibrous roots. The branching of the root is abnost identical with that
. Carnegie Institution of Washington publication. 102 THE ECOLOGICAL RELATIONS OF ROOTS. the rhizomes arise great clusters of fibrous roots from 3 to 4 mm. to only mm. in diameter. While many of these run rather vertically downward, so that some of the longer ones reach depths of 40 inches, others spread laterally to a distance of 14 to 18 inches and reach depths of only 4 to 12 inches. Thus the soil for a distance of more than a foot on either side of the plant and to a depth of 2 or 3 feet i? well supplied with these fibrous roots. The branching of the root is abnost identical with that of Erigeron asper (fig. 44), with which this species seems to Fig. 44.—Rhizome and roots of Erigeron asper. Fig. 46.—Allium cernuum. Fragaria virginiana.—Fragaria forms societies rather extensively on the forest floor, even in the dense shade of spruce seedlings. In addition to the long, slender stolons, it is furnished with rhizomes only 3 to 5 mm. in diameter but often several inches long. From these arise the dark-colored fibrous roots a millimeter or less in diameter. There are usually 6 to 10 of these on an inch of the rhizome. Many of them pursue an oblique course to a lateral distance of 4 to 10 inches from the base of the plant, where they reach a depth of 4 to 12 inches. Others penetrate more vertically downward to a maximum depth of 12 to 14 inches. While the first inch of the roots below the superficial rhizomes is rather destitute of branches, below this depth, especially in the last 6 to 8 inches, the roots are supplied with an abundance of fine rebranched termini ranging in length from 1 to 5 cm. (fig. 45).. 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 Carnegie Institution of Washington. Washington, Carnegie Institution of Washington
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