Dictyota dichotoma (Hudson) J.V. Lamouroux
Description: Thallus flat and leaf-like, to 300
mm long (usually 100-150 mm) and 5-30 mm broad; fronds thin and
translucent, olive to golden-brown, occasionally with a bluish
iridescent, and ± regularly dichotomously forked, but
lacking a midrib, and the reproductive structures are scattered
over the fronds. Very variable, with narrow spirally twisted
plants being found in mid-tidal pools, broader less twisted and
more regularly branched plants being found in lower tidal pools
(above), and broader very regularly branched, less twisted
plants in the subtidal (below). Often growing epiphytically. It
is likely that more than one species is represented in Britain
and Ireland.
Habitat: pools from mid-tide and below (see
below). Distribution: Widely distributed and
common.
Key characteristics: Absence of midrib,
± regular branching, reproductive structures scattered.
Species list
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