Abstract
An alga superficially resembling the genus Caloglossa in its habit is a previously undescribed species of Hypoglossum (Delesseriaceae, Rhodophyta). Hypoglossum caloglossoides sp. nov. occurs at Lord Howe Island in the South Pacific at a depth of 11 m, where it grows as a creeping system over coral. Additional material of this alga was found in collections from Samoa (misidentified as Calaglossa vieillardii) and from the Southern Marshall Islands (misidentified as C. leprieurii var. pygmaea). Observations are made on tetrasporangial, male and female specimens, and the relationships of this new species with other members of the genus and with Caloglossa are discussed.
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