s A Field Guide to the British Seaweeds - NMBAQC

Litosiphon laminariae
Epiphytic plant growing as fine
multiseriate filaments on the fronds
of Alaria. Found as small dark tufts
and located in the lower littoral and
sublittoral. Not to be confused with
other similar filamentous species.
Pelvetia canaliculata
Frond characteristically in-rolled
forming a central channel,
although quite limp they are
tough and slightly elastic with
swollen reproductive frond tips.
Found growing in dense tufts on
the upper region of the shore
extending to up to 15cm long.
Often found growing out of
cracks or crevices and may be
greeny brown in colour or
sometimes slightly yellow.
Natural morphology
and habitat of Pelvetia
Multiseriate filaments of Litosiphon