8 THE MARINE ALGAE OF ESSEX.
U. flacca, Holm. et Batt., "Ann. Botan.," v., p. 74 = Lyngbya
flacca, Harv., "Phyc. Brit." On muddy cement stone rocks. Felix-
stowe, May, 1884, G. P. Hope; Clacton, Jan., 1893, E. A. B.;
Southend, July, 1890, Mrs. T. H. Buffham. The specimens
gathered by Mrs. Buffham at Southend bore microzoospores, as also
did those gathered by myself at Clacton.
Cladophoracese.
CHAETOMORPHA, Kutz.
Chaetomorpha aerea, Kutz, "Spec. Alg.," p. 379. In shallow
pools near high-water mark. Felixstowe, June, 1885, E. A. B. Rare.
C. melagonium, Kutz, "Phyc. Germ.," p. 204. Felixstowe,
G. P. Hope.
C. linum, Southend, 1844, E. G. Varenne.
C. litorea, Holm. et Batt., "Ann. Bot.," vol. v., p. 74. Walton,
1873, E. G. Varenne.
C. tortuosa, Kutz, "Spec. Alg.," p. 373. Clacton, Jan., 1893,
E. A. B. Rare.
RH1ZOCLONIUM, Kutz.
Rhizoclonium riparium, Harv., "Phyc. Brit.," pl. 238.
Estuary of the Stour and Orwell, June, 1885, E. A. B.
CLADOPHORA, Kutz.
Cladophora rupestris, Kutz, "Phyc. Gener.," p. 270.
Southend, 1844, Varenne; on cement stone rock, Felixstowe and
Harwich, Hope ; between Dovercourt and Harwich, Holmes;
Clacton, E. A.B.
C. hutchinsiae, Kutz, "Phyc. Germ.," p. 210. Harwich and
Felixstowe, Hope.
C. utriculosa, Kutz, "Phyc. Gen.," p. 269, f. laetevirens,
Hauck., "Meeres-alg.," p. 455. Walton, 1845, Varenne ; brackish
water, Adderton Fleet, branch of the Horse-shoe creek, Felixstowe,
Dovercourt, Hope ; estuary of the Blackwater, Holmes.
C. glaucescens, Harv., "Phyc. Brit.," pl. 196. Harwich and
Felixstowe, Hope. The specimens of this species in Mr. Hope's
collection are not at all typical, the whole plant being larger and
coarser than is usual in this species. The main stems are from
130-170 m. and the ultimate ramuli about 50m. in diameter; in other