Ceramium bisporum (Rhodophyta, Ceramiales), an unusual new species from deep-water habitats in the Caribbean

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Abstract
A new species of Ceramium collected at a depth of 40-100 m was found along the insular shelf breaks on the southern coasts of Puerto Rico and St. Thomas, United States Virgin Islands. Ceramium bisporum sp. nov. was found only in association with dead colonies of the foraminiferan Gypsina plana (Muenster). The new species has an almost exclusively repent habit and is characterized by limited development of nodal cortication and broadly inflated rhizoids that penetrate deeply into the calcareous matrix of the foraminiferan. Occasional erect brachlets are always less than 1 mm tall. With a single exception, Ceramium bisporum is the only member of the genus known to produce bisporangia.