SUMMARY
In the red algal genus Gloiopeltis, five species (G. complanata, G. dura, G. frutex, G. furcata and G. tenax) are currently recognized, but genetic analyses have suggested considerably greater species diversity. Gloiopeltis specimens formed nine highly supported clades, six of which are morphologically referable to G. furcata. In order to identify the clade corresponding to true G. furcata, we examined the morphology and genetics of the type specimen of Dumontia furcata Postels & Ruprecht, the basionym of G. furcata, housed in the Herbarium of V.L. Komarov Botanical Institute (LE). A clade comprising the type and specimens from the northwestern to northeastern Pacific Ocean was determined to correspond G. furcata. We concluded that the type locality of G. furcata is Sitka, Alaska, based on the identity of haplotypes. We investigated the genetic divergence of populations within this species, using specimens covering most of its distributional range. We confirmed the merger of G. minuta and G. dura with G. furcata.
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