Padina japonica Yamada, 1931

Belleza, Dominic Franco C., Tateishi, Hiroto, Tanimae, Shin-Ichiro, Kobayashi, Taishun, Aota, Tomoyuki, Urasawa, Toshiki & Nishihara, Gregory N., 2025, An annotated list of brown seaweeds (Phaeophyceae) from Nakadori Island (northern Goto Islands, Nagasaki, Japan), Phytotaxa 694 (1), pp. 1-24 : 10

* Padina japonica Yamada, 1931

Japanese name: オキナƯチワ (okinauchiwa)

Syntype locality: —Various locations in Japan

Description and remarks: —Thalli are prostrate with flabellate to reniform blades 2–2.5 cm long and 1.5-3.5 cm in width. The thallus is moderately calcified on the superior surface, from the base to the middle regions while the inferior surface is very lightly calcified to almost absent.

This species grows on the shallow rocky subtidal in moderately exposed habitats at Yokoura among other species of Padina and dense stands of Colpomenia sinuosa and Hydroclathrus clathratus in late spring. This species was previously considered to be conspecific with P. santae-crucis Børgesen ( Abbott & Huisman 2003) but was later recognized to be distinct (Ni-Ni-Win et al. 2010) but occupy the same clade (Ni-Ni-Win et al. 2011).

Materials examined: —18ECS1-35 (1 to 2)