. Carnegie Institution of Washington publication. 90 THE BROAD-SCLEROPHYLL VEGETATION OF CALIFORNIA. a well-developed one. Small branches of 1 mm. or less diameter were given off rather regularly, but at long intervals, all along the main roots. These terminated in groups of mycorhizal rootlets which were embedded in masses of sand-grains held loosely together by Fig. 19.—Root system of Adenostoma fasciculatum: upper drawing shows hori- zontal, lower shows vertical distribution. In the latter case the roots are arbitrarily drawn as if growing in one plane. Another excavation of consid
. Carnegie Institution of Washington publication. 90 THE BROAD-SCLEROPHYLL VEGETATION OF CALIFORNIA. a well-developed one. Small branches of 1 mm. or less diameter were given off rather regularly, but at long intervals, all along the main roots. These terminated in groups of mycorhizal rootlets which were embedded in masses of sand-grains held loosely together by Fig. 19.—Root system of Adenostoma fasciculatum: upper drawing shows hori- zontal, lower shows vertical distribution. In the latter case the roots are arbitrarily drawn as if growing in one plane. Another excavation of considerable extent was made nearby to learn something of the subterranean relations between the chaparral shrubs and the lower plants that accompany them. The dominants here were Adenostoma fasciculatum, Quercus durata, and Arctostaphylos tomentosa. The individuals grew rather far apart, and therefore the accompanying species were more numerous than usual. A second stratum included Eriodictyon californicum, Rosa californica, Helian- themum scopariu?n, Diplacus glutinosus, and Syrmatium glabrum, low shrubs and half-shrubs. A third stratum comprised Micromeria chamissonis, Gymnogramme triangularis, and a few grasses. Below the surface only two strata were distinguishable. The upper one, about 20 cm. in depth, with some humus, was fairly well filled with the roots from the second and third aerial strata, together with great numbers belonging to the dominants, which were most conspicuous because of their large size. Below 20 cm. were found only the scat- tered, deeply penetrating roots of the 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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