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The taxonomic distinctiveness and distribution of the brown alga  Colpomenia durvillei  are debatable; the species was first described from central Chile. We analyzed mitochondrial  cox 3 and plastid  rbc L sequences from specimens collected in central Chile and Sonora, Mexico, in combination with morphological observations of specimens collected in Chile, Peru, and Mexico. Compared with other elongate species of the genus,  C. durvillei  is distinguished by erect, elongate thalli arising from a wide colpomenioid base, up to eight layers of cortical and medullary cells, and plurilocular sporangia with many layers (up to 18 locules). In all phylogenetic analyses of  cox 3 and  rbc L sequences, all elongate species of the genus formed a clade, in which  C. durvillei  was consistently distinct from congeners.  Colpomenia bullosa  was closely related to  C. durvillei  in our  cox 3 analyses, and the clade containing these two species was closely related to  Colpomenia phaeodactyla.  This is the first report to confirm  C. durvillei  by molecular data and also the first report on the occurrence of the species in Sonora, Mexico. It had previously been misidentified as a variant of  C. phaeodactyla  on the Pacific coast of South America, and the name  C. durvillei  was misapplied to  C. bullosa  in New Zealand.

Colpomenia durvillei (Scytosiphonaceae, Phaeophyceae): its distribution and relationships with other elongate species of the genus