Osmundea hybrida (Hudson) K.W. Nam
Also known as Laurencia hybrida (A.P. de Candolle)
Lenormand ex Duby
Description: Cylindrical, cartilaginous,
tufted, dark purple to greenish yellow fronds, 150 mm long. Main
axis with repeatedly pinnate branching, branches mostly
alternate, shorter towards apex giving pyramidal outline.
Ultimate ramuli short, patent, truncate.
Habitat: On stones and limpets in pools,
occasionally on mussels on open rock, rarely epiphytic, often
forming a turf in damp crevices, particularly common in upper
intertidal, widely distributed, locally abundant.
Key characteristics: Terete thallus, discoid
holdfast.
Similar species: Osmundea truncata,
which also has a discoid holdfast but is distinctly compressed
in the upper parts, and is generally found growing
epiphytically.
Photographs © M.D. Guiry
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