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By: Etchells, J.L. - Costilow, R.N. - Bell, T.A.Type: ArticleIn: Farlowia :a journal of cryptogamic botanyVolume: 4Series:Issue: 2Date: 1952Page Range: 249--264Publication Info: Cambridge, Mass, Farlow Library and Herbarium of Harvard University, 1943-1955Subjects: