Abstract
A new species of Hymenophyllum subg. Hymenophyllum with entire involucral valves is described from the Dominican Republic on the island of Hispaniola. During the prepartion of a revision of the filmy ferns (Hymenophyllaceae) for the Flora of the Greater Antilles project, a peculiar species was discovered among the undetermined specimens in the Gray Herbarium. The taxon belongs to Hymenophyllum subg. Hymenophyllum, following Morton (1968, pp. 162-164), a subgenus represented by only two species in the Antilles. Hymenophyllum tunbrigense (L.) Smith is known only from Ja- maica and Hispaniola (Proctor 1985, p. 90), whereas H. fucoides (Sw.) Sw., is more widely distributed (Proctor, 1985, p. 92; 1989, p. 58). The members of this subgenus are characterized by having toothed segment margins, and most have sinuous to toothed involucral valves as well. The new species is de- scribed as
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