CONFERVACEiE. 79 



filaments very slender, much and irregularly branched, the penultimate branches very 

 long, filiform, flexuous, simple, set with alternate or secund, short, erecto-patent ramuli, 

 some of which are simple and spine-like, others pectinated on their upper side ; articu- 

 lations filled with dense endochrome, in the branches 2-3 times, in the ramuli about 

 twice as long as broad, cylindrical, not contracted at the nodes. (Tab. XLV. B.) 



Hab. Elsinborough, Delaware, Miss E. C. Morris, (v. s. in Herb. T.C.D.) 



Tufts dense, 6-8 inches in length. Filaments inextricably bundled together, very 

 slender, much branched, the ramification of the principal divisions not determinable 

 from dried specimens. The penultimate branches which float out from the somewhat 

 rope-like tufts are generally simple for an inch or two- in length, or the longer ones are 

 furnished with similar simple branches ; and all are beset with short, erecto-patent 

 ramuli. Some of the ramuli are simple, of 3-4 cells ; others emit similar ramuli 

 on their upper side. The membrane of the cell-wall is very thick and tough, and 

 the endochrome peculiarly firm, recovering its form well on being moistened after 

 having been dried. The nodes are not contracted, and the internodes or articulations 

 rarely exceed thrice their diameter in length, and often do not reach that dimension. 

 The colour is a full dark-green, somewhat olivaceous when dried. Specimens adhere 

 closely to paper. 



I have as yet only received this plant from Miss Morris. It differs in several 

 respects from any that I now remember. 



Plate XLV. B. Cladophora Morrisice ; Fig. 1, the natural size. Fig. 3, 

 portion of a branch : and Fig. 2, a ramulus of the same; magnified. 



1. Cladophora refracta^ Roth. ; filaments very slender, rather densely tufted, bright 

 green, membranaceous (not lubricous), excessively branched ; secondary branches 

 spreading on all sides, repeatedly divided and very patent, densely set with short, often 

 opposite, recurved or squarrose branchlets, which are pectinate on the inner face with 

 patent, simple or forked ramuli ; articulations of the branches 2-4 times of the ramuli 

 about twice as long as broad. Roth. Cat. 2, p. 193. Alg. Syst. p. 114. Wyatt, 

 Alg. Danm. No. 228. Harv. Phyc. Brit. t. 24. Kiltz. Sp. Alg. p. 398. 



Hab. On rocky coasts, in tide pools, &c. Rhode Island, Mr. Olney, Mr. G. Hunt. 

 Boston Bay, Dr. A. Gray. Portsmouth, N. H., Dr. Durkee. New York, Messrs. 

 Calverley., Walters, and Pike. Newport, R. I., Professor Bailey. Seaconot, Mr. 

 Congdon. Charleston, S. C, Professor Gibbes. (v. v.) 



Tufts 2-3 inches long, feathery, rather diffuse, the main filaments sometimes inter- 

 laced in rope-like bundles. Filaments more slender than human hair, rather rigid, tough, 

 excessively branched, all the divisions patent or divaricate. The penultimate ramuli 

 are especially reflexed or refracted, and often opposite ; their ultimate divisions are 



