52 FKESH-WATER ALG^E OF THE UNITED STATES. 



oval ; sometimes has an axillary thread with others twined 

 around it. 



Widely distributed in mountain and other streams of 

 rapid and cold waters. It grows in masses firmly attached 

 by a sort of discoid root to stones or rocks, often forming a 

 turfy covering to them. Much more frequent than the 

 following. 



Plate LXIII, fig. 1, natural size 5 fig. 2, somewhat magni- 

 fied ; fig. 3, a section of a filament magnified showing the 

 nodules and the almost obsolete papillae ; fig. 4, a transverse 

 section showing the carpospores in moniliform branched 



series. 



. 



LEMANEA FLUVIATILIS, Ag. 



Filaments straight, simple or but slightly branched ; 4-5 

 inches long, often much contracted toward the base, nodules 

 more remote than in the preceding ; usually three distinct 

 verticillate papillae to each nodule. An axillary thread 

 composed of a single series of cells is found in the fertile 

 filaments. 



The specimens of this species in my possession are from 

 Northern New Jersey, South Carolina, Alabama, Rocky 

 Mountains, and California. All from rapid waters of low 

 temperature. 



Plate LXIII, fig. 5, natural size. 



LEMANEA CATENATA, Kg. 



About five inches long, regularly constricted, simple, 

 compressed, arcuate, in mass obscure violet ; papules want- 

 ing 5 spores irregularly oval or subglobose. 



Dr. Wood in his Fresh-water Algre recognizes this species 

 from the Rocky Mountains, "Mountain stream, Diamond 

 Range, altitude 6,500 feet. He adds, " In the dried state 

 they are closely interwoven into a dark purple, rigid, thin 

 mass. When soaked out they preserve the same color as in 

 mass, but each individual stem has a general light yellowish, 

 neutral ground tint, with dark-purplish or greenish black 

 bands at regular intervals. At the position of these bands 

 the filament is nearly round and contracted, whilst between 

 them it is compressed and enlarged. The spores are placed, 

 not at the swellings, but at the constrictions. The filaments 

 between the little knots of spores appear to be hollow. 

 Their walls are everywhere very thin when compared with 

 L. torulosa." 



