Dictyopteris undulata Holmes, 1896

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 : 8

Dictyopteris undulata Holmes, 1896

Japanese name: シワヤハズ (shiwayahazu)

Type locality: —Misaki, Japan

Description and remarks: —Thalli are upright and 5–15 cm tall and attached to the rocky substrate through feltlike rhizoids. Stipes are 2–3 mm in diameter, robust and winged. The blades are branched dichotomously and have obtuse to rounded apices. The margins are undulating to ruffled while older specimens have torn and tattered margins and denuded stipes. Plants in their habitat have a bluish iridescent hue but become dark brown when dried.

This species was found in Yokoura and in both ports at Mushima. Plants are highly seasonal and can be found growing on the rocky subtidal in mid-spring and persists until late autumn.

Materials examined: —18ECS1-22 (1 to 22)