SEAWEEDS OF THE BLACKWATER ESTUARY
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Fucus serratus L. Walton, Harwich, Dovercourt, Clacton, Batters
(1894); Harwich, G.M.M., 1964.
Fucus spiralis L. Blackwater Estuary, Estuaries of the Orwell and
Stour, Fambridge, Harwich and Dovercourt, Batters (1894); Fam-
bridge, Harwich and Dovercourt as F. platycarpus Thur.; Black-
water Estuary (St. Peters Flats, Bradwell Creek, Osea Island),
Fingringhoe Wick, Harwich, Clacton, G.M.M., 1963-64.
Fucus vesiculosus (L.). Walton, Harwich, Dovercourt, Felixstowe,
Batters (1894); Blackwater Estuary, Fingringhoe Wick, Harwich,
G.M.M., 1963-64.
Himanthaliacaea
Himanthalia elongata (L.) S. F. Grey Walton, Harwich, Felixstowe,
Batters (1894) (as H. Lorea Lyngb.).
Cystoseiraceae
Halidrys siliquosa CL.) Lyngb. Felixstowe, Harwich, Batters (1894).
Rhodophyceae
Florideophycideae
Nemalionales
Achrochaetiaceae
Achrochaetium sparsum (Harv.) Nag. River Blackwater (Cocum
Hills, East Mersea Stone, Stoney Point), G.M.M., 1963.
Rhodochorton floridulum (Dillw.) Nag. Dovercourt Breakwater,
Batters (1894); River Blackwater (Bradwell Creek and salt marsh),
G.M.M., 1965.
Chaetangiacea
Sciania furcellata (Turn.) Biv. Felixstowe, Batters (1894).
Gigartinales
Furcellariaceae
Furcellaria fastigiata (L.) Lamour. Walton, Clacton, Felixstowe,
Harwich, Dovercourt, Batters (1894).
Rhabdoniaceae
Catenella repens (Lightf.) Batt. Near Maldon, Batters (1894) (as
C. opuntia Grev.).
Rhodophyllidaceae
Calliblepharis ciliata (Huds.) Kutz. Walton, Felixstowe, Harwich,
Dovercourt, Clacton, Batters (1894).
Calliblepharis jubata (Good. et Woodw.) Kutz. River Blackwater
(Ray Creek, Cocum Hills, Colne Point), G.M.M., 1963.
Cystocolonium purpureum (Huds.) Batt. Felixstowe, Harwich,
Clacton, Batters (1894) (as C. purpurascens Kutz.); River Blackwater
(Bradwell Creek, St. Peters Flats, Nass End Buoy, Southey Creek,
Stoney Point, Mersea Shore, St. Osyth, Colne), G.M.M., 1963-64.
Plocamiaceae
Plocamium vulgare Lamour. 'Maldon River near Tollesbury',
Walton, Harwich, Felixstowe, Clacton, Batters (1894); River Black-
water (St. Peters Flats, Cocum Hills, Mersea Shore, Colne point,
St. Osyth, Goldhanger Creek), G.M.M., 1963-64.