Mastophora rosea

Thallus foliose, forming bushy clumps (up to 4 cm high) or dense mats, slightly calcified (chalky) on the lower surface, light purplered or pinkish on the upper surface. Branching is irregularly dichotomous. The branches are linear, 3(–5) mm wide, flat, and flabellate, slightly folded and with inrolled margins. Terminal branches slightly expanded and obtuse. In vertical section, thallus 150 μm thick, consists of one layer of cells (except conceptacular parts), cells rectangular, 52–65 μm in diam., 23–30 μm high. Sporangial conceptacles prominent, roundish with one pore, scattered over the upper surface, to 800 μm diam. Growing on rocks, dead shells and corals, intertidal to subtidal, in wave exposed sites.

Indian and Pacific Oceans (China, Japan, Taiwan, Vietnam, Philippines, Indonesia, Australia and New Zealand, Pacific Islands).