Gelidiella acerosa (Forsskål) J. Feldmann & G. Hamel 1934

Division     Rhodophyta
Class     Florideophyceae
Order     Gelidiales
Family    Gelidiellaceae
Basionym     Fucus acerosus Forsskål
SynonymFucus spiniformis Lamouroux; Fucus corneus var. spiniformis (Lamouroux) Turner; Fucus corneus var. setaceus Turner; Gelidium spiniforme (J.V.Lamouroux) J.V.Lamouroux; Sphaerococcus spiniformis (J.V.Lamouroux) C.Agardh; Sphaerococcus rigidus C.Agardh; Gelidium rigidum (C.Agardh) Greville; Echinocaulon spinellum Kützing; Echinocaulon rigidum (M.Vahl) Kützing; Gelidium corneum var. setaceum (Turner) Montagne; Gelidium ramelliferum Kützing; Echinocaulon ramelliferum (Kützing) Kützing; Gelidium pulchellum var. setaceum (Turner) Batters; Gelidiopsis rigida (C.Agardh) Weber Bosse; Gelidiella acerosa f. minima Sreenivasa Rao

    Thalli brownish-black to yellowish green with well-developed stoloniferous holdfast, 3–8 cm long and 0.5-1mm broad. Stolons form tufts or clumps of tough and wiry, flexible axes, attached by peg-like haptera or terminating in multicellular rhizoids. Erect axes cylindrical in basal parts; most often pinnately and distichously branched, more rarely radial or unilaterally branched. Main axes frequently curved, arcuate; pinnae short, 2–7 mm long, perpendicularly placed on the axis and gradually shorter towards the branch apices; branches sometimes anatomizing, predominant in prostrate parts; apices acute, hairs often present.

    Internal structure consisting of a cortex of small, ovoid, darkly-pigmented cells up to 10 layers, 8-18 μm long and 3-11 μm broad; centrally grading into larger, obovoid to irregularly shaped, thin walled medullary cells; rhizines consistently absent.


Epilithic, at low tide level, the air-exposed specimens (at low tide) still continuously wave-washed and exhibiting a more dense morphology.

Distribution in India

Andaman Islands, Gujarat, Tamil Nadu.