Chorda filum (Linnaeus) Stackhouse
Description: Thallus cylindrical, dark brown,
to 10 m long (mostly 2-6 m when mature). Frond unbranched,
5mm wide; parenchymatous, differentiated into a cortex, medulla
and small celled epidermis; elongate medullary hyphae present;
solid, becoming hollow in older plants. Frond covered by
clavate unicellular paraphyses and colourless hairs; attached by
a discoid holdfast. Unilocular sporangia formed among paraphyses
over the surface of the frond. Fronds often wound together
in rope-like masses.
Habitat: Grows on smalls stones and gravel in
the lower intertidal and shallow subtidal; sometimes epiphytic.
Photographs © M.D. Guiry
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