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The monotypic kallymeniacean genus  Ionia  established as  Iona cornu-cervi  is endemic to the Sea of Okhotsk. We observed the type material of the species deposited in the Komarov Botanical Institute of the Russian Academy of Sciences (LE, St. Petersburg, Russia) and compared it with fresh collections near the type locality. Analysis of the  rbc L dataset revealed that  I. cornu-cervi  was not distinct from other genera of the Kallymeniaceae but consistently nested within the genus  Callophyllis  and formed a sister relationship with  Callophyllis variegata . Here, we propose the new combination  Callophyllis cornu-cervi  based on  I. cornu-cervi  and treat the genus  Ionia  as a synonym of  Callophyllis .  Callophyllis cornu-cervi  is distinguished by a thallus with many slightly convoluted segments positioned at an angle to each other, forming an erect and more or less rigid plant, and a medulla composed of intermingled large and small cells.

botanica marina

Callophyllis cornu-cervi  (Perestenko) comb. nov. (Gigartinales, Rhodophyta): re-evaluation of the endemic monotypic genus  Ionia  from the Sea of Okhotsk based on morphology and molecular evidence