SEAWEEDS OF THE BLACKWATER ESTUARY 319
Cladophora fracta Kutz. Felixstowe, Batters (1894); River Black-
water (Mersea saltmarshes, St. Peters Flats), G.M.M., 1963.
Cladophora glaucesens Harv. Harwich and Felixstowe, Batters
(1894); River Blackwater (St. Peters Flats, Thirslet Spit, Stone, East
Mersea Stone), G.M.M., 1963.
Cladophora hutchinsae (Dillw.) Kutz. Harwich, Felixstowe, Batters
(1894); River Blackwater, G.M.M., 1963.
Cladophora pachyderma (Kjellm.) Brand Canvey Island, Carter
(1933).
Cladophora rupestris (L.) Kutz. Southend, Felixstowe, Harwich,
Dovercourt, Clacton, Batters (1894); Harwich, G.M.M., 1964.
Cladophora utriculosa Kutz. Walton, Adderton Fleet, Horseshoe
Creek, Felixstowe, Dovercourt, Blackwater Estuary, Batters (1894).
Rhizoclonium hieroglyphicum (C. Ag.) Kutz. Canvey Island, Carter
(1933).
Rhizoclonium implexum (Dillw.) Kutz. Fingringhoe Wick, River
Blackwater, 1963, 1964. G.M.M.
Bryopsis hypnoides Lamour River Blackwater (St. Peters Flats),
G.M.M., 1964.
Cladophorales
Cladophoraceae
Bryopsis plumosa (Huds.) C. Ag. Southend, Harwich, Felixstowe,
Batters (1894); River Blackwater, G.M.M., 1963.
Xanthopyceae
Vaucheriales
Vaucheriaceae
Vaucheria intermedia Nordst. Canvey Island, Carter (1933).
Vaucheria sphaerospora Nordst. Maldon, Holmes (1887).
Vaucheria thuretii Woron. Canvey Island, Carter (1933); River
Blackwater, G.M.M., 1963.
Cyanophyceae
Chrococcales
Chrococcaceae
Aphanocapsa marina Fosl. Clacton, Batters (1894).
Chrococcus turgidus (Kutz.) Nag. Canvey Island, Carter (1933).
Gloeocapsa crepidinum Thur. Southend, Clacton, Batters (1894).
Merisniopedia convoluta Breb. Canvey Island, Carter (1933).
Merismopedia glauca (Ehrenb.) Kutz. Canvey Island, Carter (1933).
Merismopedia revoluta Ask. Canvey Island, Carter (1933).
Chamaesiphonales
Dermocarpaceae
Dermocarpa prasina (Reinsch) Born. Clacton, Batters (1894); Har-
wich, G.M.M., 1965 (Epiphytic on Bostrychia scorpiodes).
Pleurocapsales
Hyellaceae
Hyella caespitosa Born. et Flah. Clacton, Batters (1894).