s A Field Guide to the British Seaweeds - NMBAQC

6. Branching whorled around main axis and highly branched resembling a bottle
brush Halurus equisetifolius
6. Branching not whorled……………………………………………………..…7
7. Branching opposite…………………………………………………………....8
7. Branching not opposite………………………………………………………..9
8. Plant with branching opposite and long and short branches regularly alternate,
plants dark red and delicate but slightly rigid
Ptilota gunneri
8. Plant with opposite branching but long and short branches not regularly
alternate, plants dark purple or brown and very delicate and fine
Plumaria plumosa
9. Plant with claw-like holdfast, quite long and highly branched, firm and
cartilaginous often appearing straggly Cystoclonium purpureum
9. Plant with discoid holdfast, often densely branched, terminal branches often
short and tufted Rhodomela confervoides
Group E
1. Plant highly branched……………………………………………………..…..2
1. Plant with limited branching…………………………………………………..3
2. Plant with bone shaped cells giving jointed appearance, with pointed terminal
cells, bright pink in colour, with long branches, quite delicate and hair-like
2.
Halurus flosculosus
Plant densely and usually alternately branched often appearing tufted, found
growing on rocks and other algae, present in a variety of forms, often quite
small and spongy Callithamnion/Aglaothamnion sp.
Reduced species list identification guide as required by the Water Framework Directive 37