. Studies in heredity as illustrated by the trichomes of species and hybrids of Juglans, Oenothera, Papaver, and Solanum. Heredity; Trichomes. 26 HEREDITY AS ILLUSTRATED BY TRICHOMES. In table 8 the figures in the right-hand columns are the depths of the depressions of the trichomes whose diameters are given in the correspond- ing lines in the left-hand columns. The average diameter of the heads of the disk-shaped trichomes is /*; the average depth of the depression of the heads is /*• Reference to the measurements on the disk-shaped trichomes in Juglans californica, given. FiQ. 6.—T
. Studies in heredity as illustrated by the trichomes of species and hybrids of Juglans, Oenothera, Papaver, and Solanum. Heredity; Trichomes. 26 HEREDITY AS ILLUSTRATED BY TRICHOMES. In table 8 the figures in the right-hand columns are the depths of the depressions of the trichomes whose diameters are given in the correspond- ing lines in the left-hand columns. The average diameter of the heads of the disk-shaped trichomes is /*; the average depth of the depression of the heads is /*• Reference to the measurements on the disk-shaped trichomes in Juglans californica, given. FiQ. 6.—Trichomes of Juglans nigra: a, awn-shaped trichome (ca., 242 M); 6 to k, development of disk-shaped trichomes (6, e, d, e, /, i, and k, X ,535; g, h, and j, x 84;; I to g, stages in devel- opment oflong secreting trichomes (X 535; ZX 1200). (Reduced one-fifth). at page 21, will show that those of Juglans nigra are noticeably smaller, but the structure and the development, so far as known, of the two species is the same. The long secreting trichomes are of two types, of which one has a head of 4 cells, and the other a head of about 8 cells. Of these the former will be described first. The trichome is 100 /* to 150 t^ in length (fig. 7, «to ,?).. 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 Cannon, William Austin, 1870-. Washington, D. C. , Carnegie Institution of Washington
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