Ceramium rubrum var. ambiguum
Ceramium rubrum var. diaphanum
Ceramium rubrum var. divaricatum
Ceramium rubrum var. fasciculatum
Ceramium rubrum var. fastigiatum
Ceramium rubrum var. firmum
Ceramium rubrum var. implexocontortum
Ceramium rubrum var. implexo-contortum
Ceramium rubrum var. involutum
Ceramium rubrum var. maculatum
Ceramium rubrum var. majus
Ceramium rubrum var. membranaceum
Ceramium rubrum var. nitens
Ceramium rubrum var. nodulosum
Ceramium rubrum var. pacificum
Ceramium rubrum var. pallens
Ceramium rubrum var. pygmaeum
Ceramium rubrum var. ramellosum
Ceramium rubrum var. repens
Ceramium rubrum var. squarrosum
Ceramium rubrum var. virgatum
Ceramium rubrum subsp. proliferum
Ceramium rubrum subsp. secundatum
Ceramium rubrum subsp. tenue
Ceramium rubrum f. balticum
Ceramium rubrum f. corymbiferum
Ceramium rubrum f. decurrens
Ceramium rubrum f. decurrentoides
Ceramium rubrum f. dehiscens
Ceramium rubrum f. diaphanum
Ceramium rubrum f. divaricatum
Ceramium rubrum f. fasciculatum
Ceramium rubrum f. furcatum
Ceramium rubrum f. genuinum
Ceramium rubrum f. irregulare
Ceramium rubrum f. irregularis
Ceramium rubrum f. irregularis-subcorticatum
Ceramium rubrum f. laxa
Ceramium rubrum f. lineare
Ceramium rubrum f. linearis
Ceramium rubrum f. lineatum
Ceramium rubrum f. modificatum
Ceramium rubrum f. pedicellatum
Ceramium rubrum f. radians
Ceramium rubrum f. secundatum
Ceramium rubrum f. squarrosum
Ceramium rubrum f. subcorticatum
Ceramium rubrum f. vendlicum
Ceramium rubrum f. virgatum