BED SEAWEEDS 93 



like layer of cells over the whole surface, which make the ring-like 

 bands on the filaments less conspicuous. 



Variety proliferuui. Fronds beset on all sides with simple or forked 

 branehlets. (Plate XXXIV.) 



Variety secundatmn. Branchlets generally arranged on one side 

 of the filaments, or secund. 



C. strictum (" straight "). Brown or purplish-red filaments of hair 

 like fineness, growing in tufts two to six inches high, branching in nar- 

 row forks more and more closely as they reach the top of the frond. 

 There are no principal branches, the filaments being of about the same 

 diameter and regularly dividing in a forking manner throughout. The 

 filaments are banded, the red rings being relatively very narrow. The 

 white interstices at the base are several times longer than broad, but 

 shorten gradually until at the top they are of equal length with the red 

 bands. This species is common from Cape Cod to New York. 



C. diaphanum. This species has comparatively stout leading 

 branches, with secondary alternate branches which are finer than the 

 main stems and divide in a forking manner throughout, and ultimately 

 become very fine. The color is brown or purplish -red, distinctly banded. 

 It grows on eel -grass and algae, and is found from Cape Cod to New 

 York. (Plate XXXIV.) 



C. fastigiatum. Filaments of hair-like fineness and of about same 

 size throughout ; branched in regular forking manner throughout, 

 the divisions being wide and distant at the base, but gradually becom- 

 ing closer and narrower as they reach the top ; the upper segments 

 about equal, giving a level top and regular outline in mounted speci- 

 mens ; the terminal forks erect, or less incurved than in other species ; 

 small points or branehlets emanate from some of the nodes or joints 

 between the bands of color ; tufts globe-shaped, two to five inches high ; 

 color lake-red. This species grows on mud-flats and mud-covered rocks 

 as well as on algse and eel-grass. 



C. tenuissimum. Fronds two to four inches high, densely tufted ; 

 the forked divisions very wide or open ; color rose-pink. 



Variety patentissimum. Fronds small ; the forked divisions dis- 

 tant and very wide open. A mounted specimen appears somewhat like 

 network. The species is common in Long Island Sound. (Plate 

 XXXIV.) 



GENUS Microcladia 



M. Conlteri. Cylindrical, slightly flattened main stem ; branches set 

 uniformly and alternately, short at the base, gradually lengthening as 

 far as the center, and from there diminishing to the apex of the stem, 

 giving a leaf -like outline. The same mode of branching and the same 

 outline are repeated in the branches. The ultimate divisions are like 

 forked divisions, and are somewhat incurved. The plant is six to eight 

 inches high, and in color is of many shades of red and pink. It is found 

 in abundance on the Pacific coast at all seasons. (Plate XXXV.) 



M. borealis. Branches and branehlets placed on one side of arched 

 main stems ; secondary branches curved in opposite direction and bear- 

 ing branehlets, also divided on one side only ; color dark brown. It is 

 found on the northern Pacific coast. (Plate XXXV.) 



