* THE MARINE ALG.'E OF ESSEX. 



U. flacca, Holm, et Batt., "Ann. Botan.," v., p. ']^ = 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. Buff ham. The specimens 

 gathered by Mrs. Buffham at Southend bore microzoospores, as also 

 did those gathered by myself at Clacton. 



Cladophoraceee. 

 CH^.TOMORPHA, Kiitz. 



Chaetomorpha serea, KiUz, " 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, Kiitz, "Spec. Alg.,'' p. 373. Clacton, Jan., 1893, 

 E. A. B. Rare. 



RHIZOCLONIUM, Kiitz. 



Rhizoclonium riparium, Harv., " Phyc. Brit.," pi. 238. 

 Estuary of the Stour and Orwell, June, 1885, E. A. B. 



CLADOPHORA, Kiitz. 



Cladophora rupestris, Kiitz, " Phyc. Gener.," p. 270. 

 Southend, 184^, \'arenne ; on cement stone rock, Felixstowe and 

 Harwich, Hope; between Dovercourt and FTarwich, Holmes; 

 Clacton, E. A. B. 



C. hutchinsiae, Kiitz, "Phyc. Germ.," p. 210. Harwich and 

 Felixstowe, Hope. 



C. utriculosa, Kiitz, " Phyc. Gen.," p. 269, f. /atevirefis, 

 Hauck., " Meeres-alg.," p. 455. Walton, 1845, Varenne; brackish 

 water, Adderton Fleet, branch of the Horse-shoe creek, FelixstowCj 

 Dovercourt, Hope ; estuary of the Blackwater, Holmes. 



C glaucescens, Harv., "Phyc. Brit.," pi. 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 



