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Recent phylogenetic studies of the genus  Pterosiphonia  suggest that  Pterosiphonia dendroidea  and  Pterosiphonia tanakae  are conspecific and show its wide geographic distribution in the Pacific.  Pterosiphonia dendroidea  was originally described as  Polysiphonia dendroidea  from Peru and later transferred to  Pterosiphonia .  Pterosiphonia dendroidea  was characterized by diagnostic features such as its light cortication, the presence of trichoblasts, 8–12 pericentral cells, branches with the production of 3- to 5-order laterals, and congenital fusion of 2–3 segments.  Pterosiphonia tanakae  shares these features. Our phylogenetic analysis using  rbc L sequences reveals a low gene sequence divergence (0.5%–0.7%) between the samples of  P. dendroidea  and  P. tanakae.  We propose that  P. tanakae  is a later synonym of  P. dendroidea,  and our study indicates the wide distribution of  P. dendroidea  in the northern and the southern Pacific Ocean.

Morphology and phylogeny of Pterosiphonia dendroidea (Rhodomelaceae, Ceramiales) described as Pterosiphonia tanakae from Japan