The species is dioecious producing spermatangia, carposporangia and tetraspores. Tetraspores are born in the cortical bands. The adult tetrasporophyte produces tetraspores meiotically in fours. Tetraspores occur in scattered patches sori (spores) on the mature blade, diploid blade. The tetraspores occur in spiral series resulting from a simultaneous division into 4 equal spores. Tetraspores are formed on the last three orders of branches. "Amphiroa" reproduces by means of conceptacles; it produces tetraspores. Tetraspores are formed near the ends of the branches distorting it into a spiral shape.