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Belongs within: Ceramiales.
Ceramium is a genus of small red algae with thalli composed of uniseriate filaments.
Characters (from Baker et al. 2012): Filaments terminating in caliper-like tips; uniseriate, stiff, coarse, pale to black or rose-red, 18–40 cm tall, attached by a tuft of rhizoids. Axes alternately branched below, subdichotomous to trichotomous above, wide spreading, completely corticated up to two cells below apical cell. Tetrasporangia tetrahedrally divided. Gametophytes dioecious.
<==Ceramium Roth 1797HL09 |--*C. (sect. Rhodoceras) rubrum (Hudson) Agardh 1811S57, G64, S57 (see below for synonymy) |--C. (sect. Acanthoceras) flabelligerumG64 |--C. sect. EchinocerasG64 | |--C. acanthonotumG64 | |--C. ciliatumG64 | `--C. echinonotumG64 |--C. (sect. Gongroceras) deslongchampsiiG64 |--C. (sect. Hormoceras) diaphanum (Lightf.) Roth. 1806G64, L27 [=Boryna diaphanaBS-V28, Conferva diaphanaBS-V28] | |--C. d. var. diaphanumRA05 | `--C. d. var. elegansRA05 `--C. sect. TrichocerasG64 |--C. fastigiatumG64 |--C. gracillimum (Kützing) Harvey 1876G64, L27 |--C. strictum Harvey 1851G64, S57 `--C. tenuissimum [incl. C. nodosum]G64 Ceramium incertae sedis: C. apiculatum Agardh 1876L27 C. aucklandicum Kützing 1849L27 C. australeHK90 C. californicum Dawson 1940K03 C. caudatum Setchel & Gardner 1924K03 C. codicola Agardh 1894S57 C. codii (Richards) Feldmann-Mazoyer 1938HS14 [=Ceramothamnion codii Richards 1901HL09] C. confervoides [incl. Conferva fracta]BS-V28 C. discorticatum Heydr. 1893L27 C. divergens Agardh 1894L27 C. equisetoides Dawson 1944K03 ‘Conferva’ glomerataBS-V28 C. krameri South & Skelton 2000HL09 C. laingii Rbd. 1905L27 C. macilentum Agardh 1894HL09 C. nobile Agardh 1894L27 C. nodiferum Agardh 1876L27 C. pacificum (Collins) Kylin 1925 [=C. rubrum var. pacificum]S57 C. penicillatum Bory de Saint-Vincent 1828BS-V28 C. puberulumHK90 C. pusillum Harvey 1863L27 C. shepherdiiHK90 C. stichidiosum Agardh 1876L27 |--C. s. var. stichidiosumL27 |--C. s. var. scopulorum Laing 1909L27 `--C. s. var. smithii Laing 1909L27 C. suhrianum [incl. C. miniatum Suhrr ex Agardh 1858]K03 C. uncinatum Hooker & Harvey 1855L27 C. vagans Silva in Silva et al. 1987HL09 C. vestitum Hooker & Harvey 1855L27 C. washingtoniense Kylin 1925S57
*Ceramium rubrum (Hudson) Agardh 1811S57, G64, S57 [=Conferva rubraBS-V28; incl. Ce. botryocarpumG64, Ce. decurrensG64]
*Type species of generic name indicated
References
[BS-V28] Bory de Saint-Vincent, J. B. 1828. Voyage Autour du Monde, Exécuté par Ordre du Roi, Sur la Corvette de Sa Majesté, La Coquille, pendant les années 1822, 1823, 1824 et 1825. Botanique. Cryptogamie. Arthus Bertrand: Paris.
[G64] Gray, J. E. 1864. Handbook of British Water-weeds or Algae. R. Hardwicke: London.
[HK90] Huisman, J. M., G. A. Kendrick, D. I. Walker & A. Couté. 1990. The marine algae of Shark Bay, Western Australia. In: Berry, P. F., S. D. Bradshaw & B. R. Wilson (eds) Research in Shark Bay: Report of the France-Australe Bicentenary Expedition Committee pp. 89–100. Western Australian Museum.
[HL09] Huisman, J. M., F. Leliaert, H. Veerbruggen & R. A. Townsend. 2009. Marine benthic plants of Western Australia’s shelf-edge atolls. Records of the Western Australian Museum Supplement 77: 50–87.
[HS14] Huisman, J. M., & A. Sampey. 2014. Kimberley marine biota. Historical data: marine plants. Records of the Western Australian Museum Supplement 84: 45–67.
[K03] Kumar C., A. 2003. Species of Ceramium (Ceramiales—Rhodophyta) from Kerala. Bulletin of the Botanical Survey of India 45: 173–178.
[L27] Laing, R. M. 1927. A reference list of New Zealand marine algae. Transactions and Proceedings of the New Zealand Institute 57: 126–185.
[RA05] Rath, J., & S. P. Adhikary. 2005. A check list of algae from Chilika Lake, Orissa. Bulletin of the Botanical Survey of India 47: 101–114.
[S57] Scagel, R. F. 1957. An annotated list of the marine algae of British Columbia and northern Washington (including keys to genera). National Museum of Canada Bulletin 150: 1–289.