Rhodothamniella floridula (Dillwyn) Feldmann
Also known as Rhodochorton floridulum (Dillwyn)
Näegeli; Audouinella floridula (Dillwyn)
Woelkerling]
Description: Forming a dense, brown- or
purplish-red turf 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 tetrasporangia, mostly in
winter. Monosporangia absent.
Habitat: turf-forming on sand-covered rocks,
mid- and lower intertidal, often under
Fucus serratus; widely distributed, very
common.
Similar species:
Rhodochorton purpureum forms less extensive turfs. Microscopic examination for the
presence of pyrenoids in the chloroplasts is
required to be certain of the identity of
Rhodothamniella floridulum.
Key characteristics: Turf-forming habit and
association with sand-coved rocks. Absence of monosporangia.
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