. Bulletin. Agriculture. Fig. 11.—Transverse section of a young lateral root of the third order of an olive tree from Palm Springs,Cal.,showing a hairy epidermis(Ep.) and cortex(C.). ROOT STRUCTURE OF THE OLIVE. Characteristic of the root structure of the genus Olea is the presence of stereome on the inner face of the pericambium and the prevalence of cambial cell divisions on the inner face of the leptome. Otherwise, the arrange- ment and development of the various tis- sues is not different from that of many other dicotyledons. The structure is as follows: In the young lateral roots of the t
. Bulletin. Agriculture. Fig. 11.—Transverse section of a young lateral root of the third order of an olive tree from Palm Springs,Cal.,showing a hairy epidermis(Ep.) and cortex(C.). ROOT STRUCTURE OF THE OLIVE. Characteristic of the root structure of the genus Olea is the presence of stereome on the inner face of the pericambium and the prevalence of cambial cell divisions on the inner face of the leptome. Otherwise, the arrange- ment and development of the various tis- sues is not different from that of many other dicotyledons. The structure is as follows: In the young lateral roots of the third order (figs. 11 and 12) the epidermis (Ep.) is very hairy and covers an exodermis (Ex.) of thin-walled cells in a single layer; this exodermis is not contractile. The cortex (C.) is compact and thin walled; it con- sists of eight layers, more or less filled with starch; a thin-walled endodermis (End.) is plainly visible, bor- dering on the pericambium (P.) which shows isolated strands of St. stereome (St.) outside the leptome. The stele is tetrarch, there being four strands of leptome (L.) alternating with four rays of hadrome (H.), which extend to the center of the stele. Increase in thickness begins even in these thin roots, since cambial (Camb.) divisions are noticeable on the inner face of the leptome, although the increase does not extend beyond the formation of these few layers. In lateral roots of the first or second order, on the other hand, the increase in thickness attains mucli larger dimensions, due to the a This description of the anatomy of olive roots, leaves, and stems, with ten illus- trations, was prepared at the writer's request by Dr. Theo. Holm, of Brookland, D. C, from material collected from several California groves. 57054°—Bui. 192 11 4 47. Fig. 12.—Inner i)ortion of the same transverse section of the olive root shown in figure 11, (X210.). Please note that these images are extracted from scanned page images that may have been digitally enha
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