Abstract The morphology of the little-known red alga Polyopes clarionensis Setchell et Gardner (Halymeniaceae) was studied. The development of the female and male reproductive systems is reported for the first time. Polyopes clarionensis conforms to the concept of the genus Prionitis in that the thallus is rigid, the ampullar system of the auxiliary cell is simple and representative of the Orateloupia-type', and tetrasporangia are formed in sori rather than in nemathecia. The combination Prionitis clarionensis (Setchell et Gardner) Kajimura is proposed. The species of Prionitis most similar to P. clarionensis is P. divaricata (Okamura) Kawaguchi, which differs in having flabellate fronds, segments compressed throughout except for the short cylindrical stipe and reproductive organs generally restricted to subapical portions in the ultimate segments of the thallus. Introduction Material and Methods Polyopes clarionensis was described by Setchell and Gardner (1937) on the basis of a single tetrasporophyte collected at Clarion Island in the Revilla Gigedo Islands, Mexico, by John Thomas Howell on 24 March 1932. No collections from the Pacific coast of North America have subsequently been reported for this species, but Dawson (1954: 267, footnote) attributed to it two collections from Oahu, Hawaiian Islands, one consisting of cystocarpic plants,
Botanica Marina – de Gruyter
Published: Jan 1, 1993
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