78 CONFERVACE^. 



Alg. p. 403. Var. ^. pectinella; small, very slender, all the divisions of the ramifica- 

 tion secund, the penultimate ramifications closely pectinated with short ramuli and 

 recurved. 



Hab. On rocks and stones, between tide marks and in rock pools. Halifax, W. H. H. 

 Lynn and Nahant, Mrs. Mudge. Portsmouth, N. H., Dr. Durkee. "New York Bay, 

 Messrs. Hooper, Calverley, Walters, and Pike. Beesley's Point, Rhode Island, Mr. 

 Ashmead. Var. /3. Charleston, S. C, Prof. L. Gibbes, W. H. H. (v. v.) 



Filaments very slender, 3-5 inches long, forming tufts of greater or less density, but 

 not usually entangled or interwoven, excessively branched, the main divisions and 

 principal branches flexuous, sometimes very much so, closely beset with lesser branches 

 which divide either alternately or secundly, the tendency to secund ramification 

 increasing as the frond extends. The penultimate branchlets are generally closely 

 pectinated with secund, erect, straight, simple ramuli composed of several cells ; and 

 occasionally the ramuli are fascicled, three or four springing from the same cell. Though 

 always very slender, the diameter varies. The articulations, on the whole, are pretty 

 uniform ; those of the ramuli are most consti'icted at the nodes, and also a little the 

 shortest. In drying the endochrome is dissipated from the centre of the cell, and 

 collapsed at the two ends, so that the filaments, in dried specimens, have a variegated 

 appearance under a pocket lens. On remoistening, it never perfectly recovers its form. 



My Halifax specimens are identical with those published by Mrs, Wyatt, and on 

 which the species was originally founded. Those from other localities vary in some 

 degree, being either coarser or more slender, and more or less branched ; but on the 

 British coasts similar varieties occur. 



9. Cladophora flexuosa, Grifi". ; filaments very slender, pale green, tufted, flexuous, 

 sparingly and distantly branched ; branches elongate, sub-simple, of unequal length, 

 flexuous, sometimes nearly naked, sometimes ramuliferous ; the ultimate ramuli secund 

 or alternate, short or long, curved ; articulations of the branches 3-4 times, of the 

 ramuli twice as long as broad. Griff, in Wyatt, Alg. Danm. No. 227. Harv. Phyc. 

 Brit. t. 353. 



Hab. Rock pools between tide marks, &c. Hingham, Massachusetts, Miss Brewer. 

 Boston, Dr. Durkee. Jackson Ferry and Hell Gate, New York, Messrs. Walters and 

 Pike. (v. s.) 



Very nearly related to C. glaucescens, if really specifically distinct. It is chiefly 

 known by its less compound habit, the length and nakedness of the principal branches, 

 and their flexuosity. The diameter of the filament is nearly as in C. glaucescens: the 

 articula ions are rather longer. Some of the specimens are nearly destitute of ramuli, 

 and scarcely two of those before us agree in all respects. 



10. Cladophora Morrisice; tufts elongate, dense, somewhat interwoven, dark green ; 



