s A Field Guide to the British Seaweeds - NMBAQC

Erythrotrichia carnea
This is a small, filamentous and unbranched species which is
found growing epiphytically on a range of red, green and brown
species. The filament can be several cells long and extends from
a small multicellular disc. It is often very pink in colour and may
be distinguished from other microscopic filamentous species by
its stellate (star shaped) chloroplast. Not to be confused with
Audouinella sp. which are often shorter in length, branched and
may have hairs or with Bangia atropurpurea.
Furcellaria lumbricalis
Plants completely cylindrical, cartilaginous and quite tough and dark red/brown in colour but tips may
turn green in older plants. Branching is regularly dichotomous and tends to be most dominant at the
apices which tend to taper appearing fork-like. This species can grow up to 30 cm long and 1-2 mm
thick. It is often confused with Polyides but may be distinguished by its claw-like basal attachment. It is
most frequently located in sandy bottomed pools in the lower littoral.
Furcellaria with claw-like holdfast, with dichotomous branching
and forked apices and in natural habitat,
Uniseriate unbranched
filament of Erythrotrichia
General form of Furcellaria