Species:

Note: Thallus bright red, completely corticated except near apices, and with main axis up to 3 cm long and 300–560 μm in diameter at basis. Thallus is sometimes divided to a few main axes, mostly short side branches. Thallus shows five pericentral cells per segment in a cross section. Axes and side branches are densely set with uniseriate filaments up to 4 mm long, subdichotomously branched 4–7 times and often with increasing number of cells between each branching. The filaments end in a blunt cell. Tetrasporangia are rarely found in nature, but readily develop in culture. Tetrasporangial stichidia in culture are formed on the uniseriate filaments and can grow to 85 μm wide and normally with up to 10–15 fertile segments. Four tetrasporangia are formed per section, each carrying two rounded cover cells (Sjøtun et al. 2016. Phycological Research 64: 79-94)