Note: The species grows in the intertidal, and is most abundant at wave-exposed sites during winter and early spring. The attachment point is placed within the outline of the monostromatic blade, normally giving the thallus a distinct rosette form. The species is usually dioecious, but may occasionally be monoecious. Male gametangial and zygotosporangial sori can be seen as pale-yellow and red-coloured bands respectively, around the blade margin. Sori with neutral spores can be seen as brownish red bands around the margins of the thallus. Little is known about the natural occurrence of the diploid Conchocelis phase of the species.