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Distribution

Catenella impudica (Montagne) J. Agardh

Distribution

Catenella impudica (Montagne) J. Agardh

Thallus form and type

Substratum

Occurrence

Season

Abundance

Description

Creeping and articulated spindle shaped segments

Intertidal rocks

Mid littoral zone

November - April

Scanty

Plants blackish red in colour, about 1.5 cm high, decumbent, slightly flabellately expanded, articulate with irregularly di- or tri-chotomously branched (Figs. a, b); the young segments slender, the older segments broader and more flattened, segments elliptical - oblong and deeply constricted at the nodes; ultimate segments cylindrical, prolonged into acuminate tips (Fig. c); haptera developing at nodes. A source of carrageenan.

Chondracanthus acicularis (Roth) Fredericq

Thallus form and type

Substratum

Occurrence

Season

Abundance

Description

Filamentous, cylindrical and prostrate

Intertidal rocks, calcareous substrata

Supra littoral zone, pools and crevices in the intertidal

July-November

Scanty

Plants dark red in colour, prostrate, cylindrical, slender, 3 - 5 cm in height, 0.5 mm thick, much branched, irregularly dichotomously and alternately branched; branches recurved, sometimes compressed with acuminate apices (Figs. a, b); thallus composed of filamentous medulla and cortex of anticlinal rows of cells.

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