Hypnea chordacea is a species of marine red algae found in the Indo-Pacific including Hawaiʻi.

[1] It serves as an important food source for various marine organisms.

[citation needed] Hypnea chordacea can grow up to 8 cm (3.1 in) tall.

[citation needed] Hypnea chordacea has a textured surface that can appear soft and spongy.

[citation needed] It is mostly common on rocks in the intertidal and shallow subtidal areas of the ocean as a turf-forming species found in the tropical Indo-Pacific including Hawaii.