Received for publication Jan. 14, 1980.
The authors thank M. V. Parthasarathy for the use of electron microscopy facilities and helpful advice and discussions.
Present addresses: Assistant Professor, Department of Horticultural Sciences, Texas A&M University, College Station, TX 77843; and Director of Arboreta and Center for Urban Horticulture, University of Washington, Seattle, WA 98195, respectively.
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