Synonyms: Boryna elongata; Carradoriella elongata; Ceramium brachygonium; Ceramium elongatum; Ceramium elongatum var. denudatum; Ceramium elongatum var. proliferum; Conferva elongata; Fucus muscoides; Hutchinsia elongata; Hutchinsia elongata var. denudata; Hutchinsia elongata var. prolifera; Hutchinsia lyngbye; Hutchinsia lyngbyei; Hutchinsia ruchingeri; Hutchinsia strictoides; Polysiphonia arborescens; Polysiphonia chalarophloea; Polysiphonia clavigera; Polysiphonia commutata; Polysiphonia delphina; Polysiphonia denudata f. fragilis; Polysiphonia elongata f. denudata; Polysiphonia elongata f. gelatinosa; Polysiphonia elongata f. glomerata; Polysiphonia elongata f. lyngbyei; Polysiphonia elongata f. microdendron; Polysiphonia elongata f. nana; Polysiphonia elongata f. schuebeleri; Polysiphonia elongata var. arborescens; Polysiphonia elongata var. denudata; Polysiphonia elongata var. haematites; Polysiphonia elongata var. microdendron; Polysiphonia elongata var. robusta; Polysiphonia elongata var. rosea; Polysiphonia elongata var. ruchingeri; Polysiphonia elongata var. sanguinolenta; Polysiphonia elongata var. stenocarpa; Polysiphonia fragilis; Polysiphonia haematites; Polysiphonia laxa; Polysiphonia leptoclonia (homotypic); Polysiphonia macroclonia; Polysiphonia microdendron; Polysiphonia robusta; Polysiphonia rosea; Polysiphonia ruchingeri; Polysiphonia schuebeleri; Polysiphonia stenocarpa; Polysiphonia strictoides; Polysiphonia trichodes; Polysiphonia variegata var. fragilis; Rhodomela elongata