Abstract

Morphological criteria are provided to distinguish three superficially similar species of the genus Hypoglossum Kützing. Hypoglossum barbatum Okamura is known from the western Pacific (southern Japan, Korea, and the Palau Islands), and H. minimum Yamada is known only from Japan. A new species, H. simulans, is described, with a collection from Malendure, Guadeloupe, French West Indies, designated as holotype. The apical organization of the blades in the new species distinguishes it from the other two. In addition to its occurrence in the Caribbean, H. simulans is recorded from eastern Australia, the South Pacific, and Hawaii.

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