Centroceras clavulatum (C.Agarth) Montagne 1846

Division     Rhodophyta
Class     Florideophyceae
Order     Ceramiales
Family    Ceramiaceae
Basionym     Ceramium clavulatum C.Agardh
SynonymSpyridia clavulata (C.Agardh) J.Agardh , Ceramium diaphanum var. borbonicum C.Agardh, Ceramium clavulatum var. borbonicum (C.Agardh) C.Agardh, Callithamnion ramellosum Sonder, Ceramium hyalacanthum (Kützing) Sonder, Ceramium cryptacanthum (Kützing) Sonder, Centroceras clavulatum var. cryptacanthum (Kützing) Grunow, Centroceras clavulatum var. oxyacanthum (Kützing) Grunow, Centroceras clavulatum var. brachyacanthum (Kützing) P.Crouan & H.Crouan

    Thalli rigid, dark brownish red to dark red in colour measures 6-9 cm high. Thalli attached to the substratum by multicellular rhizoids produced from periaxial cells. Thalli dichotomously branched, ultimate branches moderately forcipate and slightly incurved; adventitious branches often formed abaxially. Each dichotomy with many (up to 10) segments each 300-500µm long, 130-190µm in broad. Segments completely covered by single layer of small rectangular corticating cells, 19-23 µm in width. Axial cells colorless measures 600-760 mm long and surrounded by 12-14 periaxial cells. Each periaxial cells produce 3 corticating filaments; nodes sounded by a single or sometimes 2 layers of cortical cells; nodes with short (1-3 celled) spines. Internodes surrounded by 24-28 corticating cells.

    Tetrasporangia in a ring at the nodal regions, emergent, tetrahedrally divided spores measures 15-25 µm in width, regularly formed on specialized terminal branches or occasionally on the lateral branches. Tetrasporangia subtended by a spine, loosely covered by colourless 2-3 involucral (3-4-celled) filaments.

Distribution in India

Bombay: Back Bay, Malabar Hill, Bandra; Dwaraka; Karwar (Boergesen 1935); Tuticorin, Hare Island (Boergesen, 1937); Mahabalipuram (Srinivasan, 1946); Mandapam Camp; Rameswaram; Idinthakarai; Cape comorin (leg: Krishnamurthy); Vishakhapatnam (Umamaheswara Rao & Sreeramuly, 1970); Tiruchendur, attached to rocks above LWL (Krishnamurthy, 1980).