Children (16 direct children, 16 direct and indirect children):
Polysiphonia elongata f. baltica
Polysiphonia elongata var. arborescens
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. ß denudata
Polysiphonia elongata var. stenocarpa
Polysiphonia elongata f. expansa
Polysiphonia elongata f. glomerata
Polysiphonia elongata f. lyngbyei
Polysiphonia elongata f. microdendron
Polysiphonia elongata f. nana
Polysiphonia elongata f. schuebeleri