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Partial  rbc L sequences were obtained from the type specimens of  Lithophyllum coarctatum  and  L. gardineri . Both species were variably assigned to either  Hydrolithon  or  Porolithon  during the last two centuries, with  L. coarctatum , from the tropical eastern Indian Ocean currently considered a synonym of  L. gardineri  from the tropical western Indian Ocean. Phylogenetic analyses show that both belong in  Porolithon  and that they are distinct species despite their morpho-anatomical similarities, including a columnar morphology.  Porolithon epiphyticum   sp. nov ., from the same locality as  P. coarctatum , Cocos-Keeling Islands, is the first reported epiphytic species in the genus. Eight of the currently recognized 15 species of  Porolithon  have had their type specimens sequenced to correctly apply names, including the generitype specimen. DNA sequencing provides independent confirmation that the morpho-anatomical character of the presence of horizontal fields of trichocytes without intervening vegetative cells is diagnostic for  Porolithon . The generitypes of the four genera classified in the subfamily Metagoniolithoideae,  Dawsoniolithon ,  Floiophycus ,  Harveylithon , and  Metagoniolithon  as well as  Hydrolithon  in the subfamily Hydrolithoideae, have not been sequenced. The taxonomic and nomenclatural uncertainties in each of these genera are discussed.

botanica marina

Reinstatement of Indian Ocean  Porolithon coarctatum  and  P. gardineri  based on sequencing type specimens, and  P. epiphyticum   sp. nov.  (Corallinales, Rhodophyta), with comments on subfamilies Hydrolithoideae and Metagoniolithoideae