Plocamium genus of red algae in the family Plocamiaceae. It contains around 40 species and has a cosmopolitan distribution in temperate seas. Plocamium has erect elliptical thalli that grow up to 50 cm (20 in) in length. They are bright red in color with strongly flattened delicately branching fronds that further divide into two to five smaller branchlets.
Species classified under the genus include the following:
Accepted species Plocamium affine Kützing, 1849 Plocamium angustum (J.Agardh) J.D.Hooker & Harvey, 1847 Plocamium beckeri F.Schmitz ex Simons, 1964 Plocamium brachiocarpum Kützing, 1849 Plocamium brasiliense (Greville) M.A.Howe & W.R.Taylor, 1931 Plocamium cartilagineum (Linnaeus) P.S.Dixon, 1967 Plocamium cirrhosum (Turner) M.J.Wynne, 2002 Plocamium corallorhiza (Turner) J.D.Hooker & Harvey, 1845 Plocamium cornutum (Turner) Harvey, 1849 Plocamium cruciferum Harvey, 1855 Plocamium delicatulum Baardseth, 1941 Plocamium dilatatum J.Agardh, 1876 Plocamium fimbriatum M.J.Wynne, 2002 Plocamium fuscorubrum Baardseth, 1941 Plocamium glomeratum J.Agardh, 1851 Plocamium hamatum J.Agardh, 1876 Plocamium hookeri Harvey, 1845 Plocamium leptophyllum Kützing, 1849 Plocamium maggsiae G.W.Saunders & K.V.Lehmkuhl, 2005 Plocamium maxillosum (Poiret) J.V.Lamouroux, 1813 Plocamium mertensii (Greville) Harvey, 1847 Plocamium microcladioides G.R.South & N.M.Adams, 1979 Plocamium minutum Levring, 1944 Plocamium nanum G.W.Saunders & K.V.Lehmkuhl, 2005 Plocamium oregonum Doty, 1947 Plocamium ovicornis Okamura, 1896 Plocamium patagiatum J.Agardh, 1894 Plocamium patens G.Martens, 1868 Plocamium preissianum Sonder, 1845 Plocamium raphelisianum P.J.L.Dangeard, 1949 Plocamium recurvatum Okamura, 1913 Plocamium rigidum Bory de Saint-Vincent, 1834 Plocamium sandvicense J.Agardh, 1892 Plocamium secundatum (Kützing) Kützing, 1866 Plocamium serratulum Okamura Plocamium serrulatum Okamura, 1932 Plocamium suhrii Kützing, 1849 Plocamium telfairiae (W.J.Hooker & Harvey) Harvey ex Kützing, 1849 Plocamium violaceum Farlow, 1877 Nomina dubia: Plocamium concinnum Areschoug Plocamium froelichianum Kützing Plocamium subtile Kützing, 1866 
