320
THE ESSEX NATURALIST
Nostocales
Oscillatoriaceae
Hydrocoleum lyngbyaccum (Kutz.) Gom. River Blackwater (Osea
Island, G.M.M., 1963.
Lyngbya aestuarii ((Mert.) Liebm.) Gom. Orwell and Stour, Batters
(1894).
Lyngbya agardhii Gom. River Blackwater, G.M.M., 1964.
Lyngbya confervoides (C. Ag.) Gom. Canvey Island, Carter (1933).
Lyngbya lutea (C. Ag.) Gom. Canvey Island, Carter (1933).
Lyngbya semi-plena ((C. Ag.) J. Ag.) Gom. Southend, Batters (1894).
Microcoleus acutirostris Gom. Canvey Island, Carter (1933).
Microcoleus chthonoplastes (Mert.) Thur. Stour, Felixstowe, Batters
(1894); Canvey Island, Carter (1933); River Blackwater, G.M.M., 1963.
Microcoleus tenerrimus Gom. Canvey Island, Carter (1933).
Oscillatoria amphibia (C. Ag.) Gom. Blackwater River, G.M.M., 1964.
Oscillatoria bonnemaisonii (Crouan, frat.) Gom. Canvey Island,
Carter (1933).
Oscillatoria brevis Gom. Canvey Island, Carter (1933).
Oscillatoria corallinae (Kutz.) Gom. Stour near Harwich, Batters
(1894); Canvey Island, Carter (1933).
Oscillatoria formosa (Born.) Gom. Canvey Island, Carter (1933).
Oscillatoria margaritifera (Kutz.). River Blackwater, G.M.M.,
1963-64.
Oscillatoria nigro-viridis (Thwaites) Gom. Canvey Island, Carter
(1933); River Blackwater, G.M.M., 1963.
Oscillatoria sancta (Kutz.) Gom. Canvey Island (1933).
Phormidium angustissimum W. and G. S. West. Canvey Island,
Carter (1933).
Phormidium autumnale (Ag.) Gom. Canvey Island, Carter (1933).
Phormidium foveolarum (Mont.) Gom. Canvey Island, Carter (1933).
Phormidium tenue (Menegh.) Gom. Canvey Island, Carter (1933).
Spirulina labyrinthiformis (Menegh.) Gom. Canvey Island, Carter
(1933).
Spirulina major (Kutz.) Gom. Canvey Island, Carter (1933).
Spirulina subsalsa (Oerst.) Gom. Stour, near Harwich, Batters
(1894); Canvey Island, Carter (1933); River Blackwater, G.M.M.,
1963-64.
Symploca hydenoides (Kutz.) Gom. Felixstowe, Orwell and Stour,
Batters (1894); River Blackwater (Bradwell Creek), 1964, G.M.M.
Nostocaceae
Anabaena torrulosa Born, et Flah. Canvey Island, Carter (1933);
River Blackwater, 1964.
Anabaena variabilis (Kutz.) Born. et Flah. Stour, near Harwich,
Batters (1894).
Nodularia harveyana ((Thwaites) Thur.) Born. Canvey Island,
Carter (1933).
Pseudanabaena brevis N. Carter. Canvey Island, Carter (1933).
Rivulariaceae
Calothrix confervicola (Roth.) C. Ag. Batters (1894).