RT info:eu-repo/semantics/article
T1 A new species of Dudresnaya (Dumontiaceae, Rhodophyta) from the Canary Islands.
A1 Afonso Carrillo, Julio
A1 Sansón Acedo, Marta
A1 Reyes, J.
A2 BotánicaEcología y Fisiología Vegetal
A2 BotánicaMarina
AB A deep-water species of Dudresnaya, D. multiramosa Afonso-Carrillo, Sansónet Reyes sp. nov., is described from the Canary Islands. Gametophytes are terete and radially branched up to six orders, young branches are annulate but become non-annulate at maturity, hexagonal crystals are lacking in axial cells, rhizoids reach 60 um in diameter,inner cells of cortical fascicles are tri- to pentachotomously branched, and outer corticalcells are ellipsoid / moniliform. Spermatangia are borne singly or in pairs on terminal orsubterminal cortical cells of monoecious gametophytes. Carpogonial and auxiliary-cell filaments lack a thick mucilage coat, vegetative laterals or rhizoids. Generative auxiliary cellsare smaller and distinguishable by shape from adjacent cells of the auxiliary-cell filamentprior to diploidization. Cystocarps consist of up to 12 rounded gonimolobes and are distinctly cleft around the auxiliary-cell filament. Tetrasporophytes are unknown. The new species is mainly distinguished by the cell shapes and pattern of branching of the corticalfascicles and by the multilobed cystocarps. It differs from all other Dudresnaya species by its autapomorphic characters. The western Atlantic D. bermudensis Setchell, D. georgianaSearles and D. puertoricensis Searles et Ballantine, the Hawaiian D. littleri Abbott and theeastern Pacific D. colombiana Taylor are postulated to be most closely related to D. multi-ramosa as these are the only other members to display moniliform cortical fascicles amongthe seventeen described species of the genus.
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DS Repositorio institucional de la Universidad de La Laguna
RD 19-nov-2024