s A Field Guide to the British Seaweeds - NMBAQC

Ceramium shuttleworthianum
This is a highly branched filamentous
species with the main axis consisting of a
single row of cells. The covering of small
cells is often incomplete resulting in a
clearly banded effect. This species is
mainly characterised by the presence of
multicellular spines on the outside of each
node and the strongly hooked or in-rolled
apices. The branching pattern is regularly
dichotomous and is often densely matted.
This species of Ceramium is found in the
mid and lower littoral on rocks, mussels,
other algae and within overhangs and
crevices.
Ceramium spp.
Species displaying slight variations of
the characteristics of C. nodulosum and
C. shuttleworthianum. Some species
may be completely covered with small
cells (corticate) other may have very
distinct banding with cells present at
the nodes only. Spines may be present
or absent, the spines may be
multicellular or single celled and may
whorled, dense or sparse.
Strongly hooked apices with
spines on outside of nodes
Spines greater than
one cell in length and
with multicellular base
Banding visible with
the naked eye
Other Ceramium species may be spined, highly
corticated or highly banded