. A textbook of botany for colleges and universities ... Botany. 782 ECOLOGY. accumulation of food in the affected tissues. In some cases parasites cause atrophy (reduced cell size) or hypoplasy (reduced cell number). Often gall tis- sues remain in a condi- tion more primitive than that of uninfected tissues; the primordia of wood and bast, for example, often remain parenchymatous instead of developing into complex tissues. The most astonishing feature of galls is the de- velopment of nutritive Figs. 1090—1093. — Cross sec- tions of galls, showing anatomical features: 1090, a solid cynipid gal
. A textbook of botany for colleges and universities ... Botany. 782 ECOLOGY. accumulation of food in the affected tissues. In some cases parasites cause atrophy (reduced cell size) or hypoplasy (reduced cell number). Often gall tis- sues remain in a condi- tion more primitive than that of uninfected tissues; the primordia of wood and bast, for example, often remain parenchymatous instead of developing into complex tissues. The most astonishing feature of galls is the de- velopment of nutritive Figs. 1090—1093. — Cross sec- tions of galls, showing anatomical features: 1090, a solid cynipid gall from an oak twig, cut in half; note the radiating lines of tissue, and the central larval chamber (c); 1091, a section of an oak gall; e, epidermis; 0, cortex, the grains representing plastids (chloroplasts above and leucoplasts with prominent starch grains below); 5, protective layer of sclcrenchymatous cells;/,/', nutritive layers adjoining the larval chamber, / being a layer rich in starch, and /' a layer whose cells are rich in proteins and prominently nucleated; 1092, part of the nutritive tissue of the gall of Nematus gallorum; note the resemblance to the tissues in an intumescence; 1093, iso- lated nutritive hairs of a Cepha- loneon gall from a maple (Acer); 1091-1093, highly magnified. — 1090 after Kerner, 109 i after Lacaze-Duthiebs, 1092, 1093 after KiJsiER,. 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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