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.
Link: Algaebase
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