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Morphological Variation in Epicuticular Wax of SO2-Sensitive and -Tolerant Eastern White Pine Clones. C. R. Krause, U.S. Department of Agriculture, Agricultural Research Service, Nursery Crops Research Laboratory, Delaware, OH 43015; D. B. Houston, Department of Forestry, Ohio Agricultural Research & Development Center, Wooster 44691. Phytopathology 73:1266-1269. Accepted for publication 25 April 1983. This article is in the public domain and not copyrightable. It may be freely reprinted with customary crediting of the source. The American Phytopathological Society, 1983. DOI: 10.1094/Phyto-73-1266.

Needle surfaces of sulfur dioxide-tolerant and -sensitive clones of Pinus strobus were examined by scanning electron microscopy to determine if variability related to sensitivity class correlated with differences in epicuticular wax morphology. Epistomatal wax formed a continuous covering over the stomata of tolerant clones, but was split longitudinally over the stomata of sensitive clones.

Additional keywords: cold-stage microscopy, osmium-vapor fixation, Pinus strobus, scanning electron microscopy, split epistomatal wax.