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W.J. Woelkerling, A.J.K. Millar, A. Harvey andM. Baba. 2008. Recognition of Pachyarthronand Bossiellaas distinct genera in the Corallinaceae, subfamily Corallinoideae (Corallinales, Rhodophyta). Phycologia47: 265–293. DOI: 10.2216/07-85.1New evidence supports recognition of both Pachyarthronand Bossiellaas distinct genera within the Corallinaceae, subfamily Corallinoideae (Corallinales, Rhodophyta). Pachyarthron cretaceum, the type species of Pachyarthron, is confirmed to occur in Australia, and a new study of the designated lectotype of P. cretaceaand of plants from Australia, Japan, Canada (British Columbia) and the United States (Alaska, Washington State) has shown that male conceptacles are produced both axially at branch tips and laterally on intergenicula. By contrast, only lateral conceptacles occur in Bossiella. Differences between Pachyarythronand Serraticardia& Marginisporum, the only genera of Corallinoideae known to produce both axial and lateral conceptacles, are outlined, and a comparison of and key to all genera of Corallinoideae are included. An emended generic description of Pachyarthronand an account of P. cretaceumare provided. Brief accounts of four infraspecific taxa never transferred into Pachyarthronbut attributed to the homotypic synonym Amphiroa cretaceumalso are included. These are Amphiroa cretaceaf. breviarticulata(Areschoug) Yendo from the Caribbean; A. cretaceaf. capensis(Areschoug) Yendo from South Africa; A. cretaceaf. rosariformisYendo from Japan; and A cretaceaf. tasmanica(Sonder) Yendo from Australia. The biogeographic implications for Pachyarthronand Bossiellaare reviewed; Bossiellashould be removed from the floras of Japan, Korea and China, whereas Pachyarthronshould be added. |
