Gracilariopsis longissima (S.G.Gmelin) Steentoft, L.M.Irvine & Farnham 1995

Division     Rhodophyta
Class     Florideophyceae
Order     Gracilariales
Family    Gracilariaceae
Basionym     Fucus longissimus S.G.Gmelin
SynonymFucus verrucosus Hudson; Fucus confervoides Linnaeus; Ceramium confervoides F.H.Wiggers; Sphaerococcus confervoides (F.H.Wiggers) Stackhouse; Flagellaria verrucosa (Hudson) Stackhouse; Gigartina confervoides (Linnaeus) J.V.Lamouroux; Sphaerococcus verrucosus (Hudson) C.Agardh; Sphaerococcus confervoides var. verrucosus (Hudson) C.Agardh; Gracilaria confervoides (Linnaeus) Greville; Hypnea confervoides (C.Agardh) J.Agardh; Gracilaria verrucosa (Hudson) Papenfuss; Gracilariopsis verrucosa (Hudson) Steentoft, L.M.Irvine & Farnham

    Thallus very delicate, grow up to a metre in length. Thallus highly branched, terete, and erect attached by small circular disc; fronds arises from single main axis, uniformly thin and delicate; branching lateral, rarely subdichotomous, opposite or subopposite in arrangement, frequently alternate; branch tips attenuated; branches up to third or even fourth order, ultimate branches 4-12mm length and 0.5mm thickness. Cortex of 2-4 layers of cells, outermost cells radially elongated, 10µm x 7µm some being modified to form enlarged cyst like cells produced on the surface as tubular hairs, inner cortex cells large and more or less oval. Medulla of 3-5 layers of cells, spherical or ovoid central large cells measure 300µm across; cells of medulla progressively smaller from the centre outwards, oval 18 µm x13µm to141 µm x 154 µm. Transition from cortex to medulla is abrupt. Cystocarps sub- spherical, elevated and scattered. Carpospores are sympodially developed from the tips of the gonimoblast filaments as short series.


Tide pools, Shallow reefs and intertidal zone

Distribution in India

Keelakarai, Pamban, Pulicate Lake Tuticorin, Tamil Nadu; Chilka Lake, Goa