Corallina caespitosa R.H.Walker, J.Brodie & L.M.Irvine
Description: Base crustose, erect fronds up to 45 mm
long, stiff, unbranched stipe, branching dense, irregularly
simple to compound pinnate; intergenicula generally longer than
broad, cylindrical at frond base, becoming compressed,
wedge-shaped toward the frond apex, typically with 10–15
tiers of medullary cells; apex with 3–4 or more (up to 7)
intergenicula or occasionally a single undivided irregular
intergeniculum. Spermatangial conceptacles axial, beaked,
500–600 µm in diameter; tetrasporangial conceptacles
axial, sometimes pseudolateral, 450–600 µm in
diameter; carposporangial conceptacles unknown.
Habitat: Intertidal on rock in mid- to lower-shore
rockpools; on Mytilus on wave-exposed shores in the
west of Ireland. Occasional.
Distribution: Widely distributed in Ireland;
Britain north to Yorkshire; Channel Islands; Northern France
(Channel and Atlantic); Portugal; Azores, Italy; Greece; Canary
Islands; Ghana; South Africa; California; New South Wales;
Japan.
Similar species:
Corallina officinalis
is commoner, is more chalky in colour, has less regular
branching, and generally has more rounded articulations.
Jania rubens is
dichotomously branched;
Jania squamata is
pinnately branched, but is rare, and tends to be found mostly as
epiphytic growths on Cystoseira in pools.
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