SEAWEEDS OF THE BLACKWATER ESTUARY 327
Stone, Cocum Hills, Mersea Shore, Colne Point, Stoney Point, Decoy
Point, Bradwell Creek), G.M.M., 1963.
Polysiphonia insidiosa Crouan frat. River Blackwater (East Mersea
Stone), G.M.M., 1963.
Polysiphonia lanosa (L.) Tandy Harwich, G.M.M., 1965.
Polysiphonia nigrescens (Huds.) Grev. Felixstowe, Harwich, River
Deben (as P. affinis Moore), Batters (1894); River Blackwater,
G.M.M., 1963-64-65.
Polysiphonia simulens Harv. River Blackwater (St. Peters Flats,
Thirslet Spit, Cocum Hills, Mersea Shore), G.M.M., 1963.
Polysiphonia spiralis Batten River Blackwater (Bradwell Creek),
G.M.M., 1965.
Polysiphonia urceolata (Dillw.) Grev. Harwich, Felixstowe, Batters
(1894).
Polysiphonia violacea (Roth.) Grev. River Blackwater (Bradwell
Creek, Ray Creek), G.M.M., 1963.
Rhodomela confervoides (Huds.) Silva Dovercourt, Harwich, Felix-
stowe, Clacton, Batters (1894) (as R. subfusca Ag.).
Bangiophycideae
Goniotrichales
Goniotrichaceae
Goniotrichum alsidii (Zanard) Howe River Blackwater (St. Peters
Flats, St. Osyth, Cocum Hills, Mersea Shore, Stoney Point), as
epiphyte, G.M.M., 1963 (as G. elegans).
Bangiales
Erythropeltidaceae
Erythropeltis discgera (Berth.) Schm. Harwich, G.M.M., 1964
(epiphytic on Cladophora sp.).
Erythrotrichea carnea (Dillw.) J. Ag. River Blackwater (St. Peters
Flats, Osea Island, Cocum Hills), G.M.M., 1963.
Bangiaceae
Bangia fuscopurpurea (Dillw.) Lyngb. Harwich, Felixstowe,
Batters (1894).
Porphyra leucostica Thur. Near Harwich, Batters (1897).
Porphyra purpurea (Roth.) C. Ag. Maldon, Harwich, Clacton,
Batters (1894).
Porphyra umbilicalis (L.) J. Ag. Southend, Batters (1894); River
Blackwater, Fingringhoe Wick, Harwich, Clacton, G.M.M., 1963-64-65.