Synonyms: Ceramium violaceum; Ceramium violaceum var. nigrescens; Conferva atrorubens; Conferva fucoides; Conferva nigrescens; Hutchinsia nigrescens; Hutchinsia nigrescens var. pectinata; Hutchinsia violacea; Hutchinsia violacea var. nigrescens; Polysiphonia affinis; Polysiphonia atropurpurea (homotypic); Polysiphonia nigrescens; Polysiphonia nigrescens f. flaccida; Polysiphonia nigrescens f. fucoides; Polysiphonia nigrescens f. pectinata; Polysiphonia nigrescens f. protensa; Polysiphonia nigrescens f. senticosa; Polysiphonia nigrescens var. flaccida; Polysiphonia nigrescens var. fucoides; Polysiphonia senticosa (homotypic); Polysiphonia urceolata f. fucoides; Polysiphonia violacea; Vertebrata fucoides