Visiting Scholar at University of Wisconsin—Madison.
Research leader and professor.
Received for publication January 13, 1983. This research was supported by the College of Agricultural and Life Sciences, University of Wisconsin, Madison, and by Hatch Project No. 2378. The authors thank E. Garvens and M. Garment for their assistance in scanning electron microscopy, and Steve Vicen for his assistance with the preparation of photographic materials. The cost of publishing this paper was defrayed in part by the payment of page charges. Under postal regulations, this paper therefore must be hereby marked advertisement solely to indicate this fact.
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