A taxonomic study of the Elachista taeniaeformis complex and E. vellosa from the western Pacific (Elachistaceae, Phaeophyceae)
2001
Uwai, Shinya | Kogame, Kazuhiro | Masuda, Michio
Three brown algae, Elachista taeniaeformis, Elachista flaccida and Myriactula clavata, which seem to resemble one another in many features and constitute a complex that we call the E. taeniaeformis complex, have been distinguished in the western Pacific by the degree of tapering of the assimilatory filaments, the presence or absence of phaeophycean hairs, and the presence or absence of paraphyses. Morphological observations and laboratory culture experiments based on collections from various localities in Japan indicated that these morphological characters vary, depending on the growing season, experimental culture conditions and age. Molecular-phylogenetic analyses of these and four other elachistacean species, based on ITS regions of the nrRNA gene, showed a close relationship between all samples of the three taxa. Morphological and molecular data indicate that only a single species, E. taeniaeformis, is present within the complex and that genuine E. flaccida should be excluded from the western Pacific marine algal flora. Myriactula clavata is synonymized with E. taeniaeformis, as is Elachista sadoensis. Elachista vellosa is closely related to E. taeniaeformis in the molecular-phylogenetic analyses but is distinguished from it morphologically by having slightly tapering assimilatory filaments with gradually constricted bases.
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