CONFERVACE^. 77 



below. They are fastigiate and very irregularly divided, but mostly straight, with erect 

 branches and ramuli. The lower articulations are short ; the upper, and especially the 

 terminal ones, are very long. The endochrome generally recovers its form after having 

 been dried, at least in the younger portions of the frond, if it have not been discharged, 

 as often happens, by the rupture of the membrane, when the frond is immersed in fresh 

 water. This plant adheres closely to paper. 



A much smaller species than C. arcta, to which, as well as to C. uncialis, it is nearly 

 allied. 



7. Cladophora uncialis, Fl. Dan. ; tufts short, vivid-green, very dense, spongy, 

 globose, simple or somewhat lobed, fastigiate, composed of numerous filaments matted 

 together by lateral rootlets ; filaments flexuous, sparingly bi'anched, interwoven ; 

 branches and ramuli distant, patent, curved, alternate or secund ; articulations of 

 uniform length, about twice as long as broad. FL Dan. t. Ill, jig. 1. Lyngb. Hyd. 

 Dan. t. 56. Ag. Syst. p. 111. Wyatt, Alg. Damn. 146. Harv. Phyc. Brit. t. 207. 

 Kutz. Sp. Alg. p. 420. 



Hab. On rocks near low water mark. Prince Edward's Island, Dr. Jeans. Halifax, 

 W. H. H. Nahant, Mrs. Mudge. (v. v.) 



Tvfts about an inch in height and diameter, very dense and spongy, either somewhat 

 globose, or cleft into numerous spongy divisions, fastigiate. Filaments very numerous 

 from a common base, densely matted and interwoven by root-like processes developed 

 along the sides, flexuous, more or less compound. Branches very irregularly disposed, 

 generally distant, secund or alternate, once or twice again divided, and having a few 

 patent, curved, simple ramuli. Colour, when growing, a vivid-green ; instantly dis- 

 charged in fresh water, and in drying the specimen fades to a pale yellow-green, especially 

 toward the centre of the tuft. The endochrome recovers its form and fills the cell, on 

 moistening after having been dried. The articulations in all parts of the filaments are 

 of nearly uniform length, twice or thrice as long as their diameter. Substance soft but 

 not gelatinous. 



Very nearly related to C. lanosa, but the place of growth is different, and the fila- 

 ments are more flexuous, the branches more patent, and the rooting processes more 

 numerous. 



**** Graciles. Filaments loosely tufted, feathery, very slender, pale or bright-green. 



8. Cladophora glaucescens. Griff. ; filaments loosely tufted, pale or glaucous green, 

 very slender, flexuous, excessively branched ; branches erecto-patent, flexuous, repeat- 

 edly sub-divided, the penultimate ones pectinated with closely set, elongate, straight, 

 slender, many celled, erect or sub-erect ramuli ; axils acute ; articulations constricted 

 at the nodes, nearly uniformly thrice as long as broad, those of the main branches a 

 little the longest. Wyatt, Alg. Danm. No. 195. Harv. Phyc. Brit. t. 196. Kutz. Sp. 



