220 FRESH-WATER ALGJS OF TUE UNITED STATES. 



B. inonilifbrine, (ROTH.) 



B. pollicare, bi- tripollicaro, raro pedale, muco gelatinoso pins minus firmo involutum, viola- 

 ceum, fuscum, rufo-brunneum, purpureum vel ca:ruleo-viridiscens, vage ramossissimum ; ramu- 

 lorum articulis omnibus conformibus, oblongo-subclavatis, extremis nonnunquam setigeris; 

 internodiis nudis vel ramulis accessories singulis sparsis instructis. 



Diam. Tetrasp. globulus y*$ v = .006. 



Syn. B. moniliforme, ROTH. RABENHORST, Flora Europ. Algarum, Sect. III. p. 405. 



Hab. In aquis puris, Michigan ; Gray. New York ; Bailey. Virginia ; Jackson, Alabama ; 

 Tuomey. South Carolina ; (Ravenel) Pennsylvania; New Jersey; Wood. 



One inch to a foot in length, clothed with a more or less firm gelatinous mucus, violet, fuscous, 

 reddish-brown, purple, or bluish-green, vaguely and profusely branched ; joints of the 

 branches similar, oblong-subclavate, the outer ones sometimes setigerous; internodes naked 

 or furnished with a few scattered accessory branchlets. 



Remarks. This species is very abundant in fresh, cool rivulets, in springs, in 

 limestone waters, in pine-barren streams, and even occasionally in ditches, wherever 

 I have botanized in Pennsylvania and New Jersey. It varies greatly in size, in 

 color, and other particulars. 



The branchlets, as I have observed them, are most generally not setigerous, but 

 at times they are provided with seta of moderate length. 



I have found numerous fruiting fronds, but in none of them was the fruit in 

 great abundance, not nearly so much so as in the Kocky Mountain species. 



B. vagiilll, (ROTH) AGARDH. 



B. vage ramossissimura, uni- vel tripollicare, fuscum vel cerugineum ; internodiis inferioribus 

 ramellis numerosis obessis, superioribus nudis vel subnudis ; ramulorum articulis extremis 

 setis longissimis instructis. 



Diam. Tetrasp. globulus ,1^= .00333. 



Syn. B. vagum, (ROTH) AOARDH. RABENHORST, Flora Europ. Algarum, Sect. III. p. 406. 



Hab. In aquis quietis, Tlintah Mountains, Nevada ; (S. Watson). 



Vaguely branched, one to three inches long, brownish or seruginous ; internodes the inferior 

 covered with a dense mass of branchlets the superior naked, or nearly so; last articles 01 

 the branchlets provided with an extremely long seta. 



Remarks. I have received from Mr. Sereno Watson some half a dozen dried 

 algae, which I have referred to B. vagum, with some doubt. They are labelled as 

 having grown in shallow water, in a beaver pond, in Pack's Canon, Unitas, Uintah 

 Mountains, Nevada, at an altitude of 7000 feet. All the descriptions of B. vagum 

 which I have seen are singularly imperfect; in none is it stated how large the spore 

 masses grow, and how plentifully the branchlets are provided with seta. As far 

 as the descriptions go, however, my specimens agree with them, and I have, there- 

 fore, refrained from indicating a new species. The plants are. remarkable for the 

 profusion and extreme length of the seta, and for the quantity of fruit which 

 they produce. The fruit masses are small but very compact, scarcely more than 

 half the size of those of the preceding species. The verticles of branchlets are 

 often completely joined, and as it were almost swallowed up by the mass of inter- 

 vening scattered branchlets which arise directly from the main axis. In the distal 



