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Cover Illustration: Light micrographs of median longitudinal sections of root apical meristems (RAMs) from basal angiosperms, monocots, and eudicots are pictured, left to right: top, Magnolia grandiflora, Cabomba caroliniana, and Ranunculus muricatus; bottom, Clivia miniata, Commelina communis, and Quercus rubra. This project, to characterize the arrangement of patterns of cells in the organization of angiosperm RAMs, was conceived by Heimsch in the early 1950s; the specimens in this montage of root tips were produced from 1956 until 2003 and were photographed with brightfield illumination on a Zeiss Axiophot microscope (University of Waterloo). See Heimsch and Seago—Organization of the root apical meristem in angiosperms, pp. 1–26 in this issue. Cover credit: Photography by James Seago, graphics by Jeffrey Welsh.