s A Field Guide to the British Seaweeds - NMBAQC

Chondrus crispus
This species is cartilaginous, often quite tough
and slightly elastic, with frond displaying
regularly dichotomous divisions. Fronds are
completely flat and may be quite wide and
wedge shaped. The stipe is also completely
flat and much narrow than the main frond.
Colour may vary from light brown and yellow
to deep red or purple. Found throughout the
littoral zone on a variety of surfaces, very
common. Not to be confused with
Mastocarpus stellatus which has a slightly
channelled frond. May be fluorescent in water.
Corallina officinalis
Plant consisting of erect jointed calcareous
structure often appearing bone-like.
Branching pattern regularly opposite. Pink
in colour often turning completely or
partially (just the tips) white due to
bleaching. Some fronds may appear
elongate where as others may be more fan
shaped. Found in the mid littoral through to
the sublittoral most commonly within
rockpools but may be found on open rock
surfaces.
Chondrus in its natural
habitat in a range of
colours and showing
its narrow stipe and
flat dichotomous frond
Corallina found
commonly in
rockpools consisting
of a calcareous bonelike
frond light pink
in colour.