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Zoned; ringed; having concentric layers of differing texture or pigmentation.
Farlex Partner Medical Dictionary © Farlex 2012


(zō′nāt′) also


Biology Having zones of a different color or texture, as rings or bands.
The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.
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Late Permian azonate and zonate trilete spores from Chhidru Formation, Salt Range, Pakistan.
Description.--Fruiting bodies: Semicircular to fan-shaped and sessile or occasionally nearly circular with a rudimentary stipe; nearly planar, 8.5-15.5 cm broad; leathery and flexible when young and moist, rigid and hard corky when dry; white to cream throughout or the bases occasionally umber to black; surface dry, ranging from very finely tomentose and velvety to the touch, to glabrous and smooth with age, often concentrically zonate, especially near the margin, and warted with age.
Inflorescence apical meristems can have any of three possible cellular arrangements (dep ending on the taxon): "tunica/corpus," "mantle/core," or "zonate" configuration.
Lobophora variegate, "zonate decumbent-" and "brown decumbent-" bladed forms (Bahamas and North Carolina).
Morphologically, this genus can be differentiated from Lactarius by complete absence of zonate and glutinose caps, includes all annulate species and may contain species with veils and velvety caps (Buyck et al., 2008).
Specimens were further confirmed by the presence of zonate tetraspores embedded in surface patches within the thalli.
Descriptions of the histological patterns seen in sections of the pteridophyte shoot apex allowed closer comparisons with the zonate meristems of gymnosperms and angiosperms.
RTx437 is susceptible to grain mold, but has moderate levels of resistance to rust (caused by Puccinia purpurea Cooke), and zonate leaf spot (caused by Gloeocercospora sorghi D.
Genetic basis of resistance to zonate leaf spot disease in forage sorghum.
Tx2911 is moderately susceptible to rust (caused by Puccinia purpurea Cooke), and zonate leaf spot (caused by Gloeocercospora sorghi Bain & Edgerton ex Deighton).