326 THE ESSEX NATURALIST
Flats, Bradwell Creek, St. Osyth, Thirslet Spit, Stone, Osea Island,
Mersea Shore, Colne Point, Stoney Point, Decoy Point, Goldhanger
Creek), G.M.M., 1963-64.
Halurus equisetifolius (Light.) Kutz. Felixstowe and Harwich,
Batters (1894).
Pleonosporium borreri (Sm.) Nag. Felixstowe Pier, Batters (1894);
River Blackwater (East Mersea Stone), G.M.M., 1963.
Plumaria elegens (Bonnem.) Schm. Felixstowe, Harwich, Batters
(1894).
Ptilothamnion pluma (Dillw.) Thur. River Blackwater (St. Peters
Flats, Cocum Hills, St. Osyth, Mersea Shore), G.M.M., 1963.
Spermothamnion repens (Dillw.) Rosenv. Clacton, Batters (1894) (as
S. turneri Aresch.).
Delesseriaceae
Apoglossum ruscifolium (Turn.) J. Ag. Harwich, G.M.M., 1964.
Cryptopleura ramosa (Huds.) Nardo Walton, Felixstowe, Clacton,
Batters (1894) (as Nitophyllum laceratum Grev.)
Delessaria sanguinea (Huds.) Lamour. Harwich, Batters (1894) (as
Hydrolapathum sanguineum, Stackh.).
Hypoglossum woodwardii Kutz. Felixstowe and Harwich, Batters
(1894) (as Delessaria hypoglossum Lamour.), River Blackwater
(Southey Creek), G.M.M., 1963.
Membranoptera alata (Huds.) Stackh. Mersea Island, Harwich,
Felixstowe, Clacton, Batters (1894) (as Delessaria alata Lamour).
Phycodrys rubens CL.) Batt. Felixstowe, Batters (1894) (as Delesaria
sinuosa Lamour.).
Polyneura gmellinii (Lamour.) Kylin River Blackwater (Thirslet
Creek, Thirslet Spit, Southey Creek, Mersea Shore), G.M.M., 1963.
Dasyaceae
Heterosiphonia plumosa (Ellis) Batt. Felixstowe, Harwich, Clacton,
Batters (1894) (as Dasya coccinea Ag.).
Rhodomelaceae
Bostrychia scorpiodes (Huds.) Mont. Maldon, Wivenhoe, Felixstowe,
Blackwater Estuary, Batters (1894); Canvey Island, Carter (1933);
Harwich, G.M.M., 1964-65.
Brogniartella byssoides (Good. et Woodw.), Schm. Walton, Felix-
stowe, Batters (1894).
Chondria dasyphylla (Woodw.) C. Ag. Blackwater Estuary, Harwich,
Felixstowe, Batters (1894); River Blackwater (St. Osyth, Mersea
Island, Stone, Cocum Hills, Colne Point), G.M.M., 1963.
Chondria tennuissima Good. et Woodw. River Blackwater (St.
Peters Flats, Bradwell Creek, Thirslet Creek, Stone, Southey Creek,
Osea Island, Cocum Hills, Ray Creek, Colne Point), G.M.M., 1963.
Laurencia hybrida (DC.) Duby Felixstowe, Harwich, Blackwater
Estuary, Batters (1894) (as Laurencia caespitosa).
Laurencia obtusa (Huds.) Lamour. River Blackwater (St. Osyth,
Cocum Hills, Head of Ray Creek, Colne Point, Stoney Point, Mersea
shore), G.M.M., 1963.
Polysiphonia elongata (Hurd.) Harv. Blackwater Estuary, Batters
(1894); River Blackwater (St. Peters Flats, St. Osyth, Thirslet Spit,