Colaconema caespitosum (J. Agardh) Jackelman, Stegenga & Bolton
Description: Forming dense, brownish-red tassel-like
tufts of sparingly branched erect, uniseriate hair-like
filaments. Cells oblong, 3-4 times as long as broad. Several
plastids, each with a pyrenoid, against cell wall. Reproducing
by monosporangia, all year around. Tetrasporangia occasionally
formed in winter.
Habitat: On limpets (Patella , mainly
P. vulgata) on exposed shores and epiphytic on
Codium fragile in the lower intertidal of exposed and
semi-exposed coasts. Commoner on western and south-western
coasts of Britain and Ireland than records indicate; south to
Morocco. Adriatic. South Africa. Australia and New Zealand.
Similar species:
Rhodochorton purpureum
and Rhodothamniella floridula
which are do not occur on limpets, are generally turf-forming
and do not form monosporangia.
Key characteristics: Association with limpets; tasellated
growth form of tufts. Abundant and large monosporangia.
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