Gracilaria gracilis (Stackhouse) M. Steentoft, L.M. Irvine & W.F. Farnham
Description: Cartilaginous, cylindrical, dull
purple-red fronds, to 500 mm long, one or several arising from
small, fleshy, perennial discoid holdfast. Branching very
irregular, sparse or profuse, branches to 2 mm diam., apices
pointed. Internal tissue of large thin-walled more or less
colourless cells with narrow outer cortical zone of small
coloured cells.
Habitat: On rocks and stones, intertidal and
subtidal, especially on sandy shores, generally distributed,
common.
Usage: A species of importance for agar
production in other parts of the world.
Note: Occasionally infected with the
colourless, hemispherical parasite
Holmesella pachyderma.
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