L. H. HuiDepartment of Botany, University of Hong Kong, Hong Kong
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and
S. Y. Zee
S. Y. ZeeDepartment of Botany, University of Hong Kong, Hong Kong
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Contributor Notes
Received for publication January 19, 1980.
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.