FRESH-WATER ALG^ OF THE UNITED STATES. 223 



li. torulosa, (Roth) Ao. 



L. subsimplex, plerumque arcuata, cartilaginea et nonnihil rigida, 1-2 pollices longa; nodulis 

 approximatis, papillis applanatis, plerumque 4-6 enormiter verticellatis, vel nonnihil sparsis, 

 interdum nonnihil confluentibus ; sporis ovalibus. 



Z>wm.— Sporis. transv. max. ,.^§77"— t^V%tt"- 



Syn.—L. tomlosa (Roth) Ag. Rabenhoust, Flora: Europ. Algarnm, Sect. III. p. 411. 



Hah. — In flumine, Kentucky-; (Sh»rt) Hjirvey. Pennsylvania; Yirginia; New York; New 

 Jersey; "Wood. 



Subsimple, mostly arcuate, cartilaginous and somewhat rigid, 1-2 inches long ; nodules ap- 

 proximate, with their papules applanate, mostly 4-6, irregularly verticillate or somewhat 

 scattered, sometimes slightly confluent; spores oval. 



Remarhs. — This plant attains a length, of about two inches, and grows in masses 

 attached to rocks, often forming a sort of turfy covering to them, in rapidly run- 

 ning water. In mass it has a grayish or blackish appearance. The filament has 

 a grayish groundwork, with a dark band at the position of the nodes, which are 

 enlarged aild inclose the spores. The transverse outline of the filament is a very 

 irregular circle. I have found this species very abundant in the rapid water of the 

 Schuylkill, just above Flat Rock Tuiinel, on the Reading Railroad, eight or nine 

 miles above Philadelphia. Prof. E. D. Cope has sent me specimens collected by 

 himselL in swift streams in Western Virginia, and Mr. Austin has obtained it in 

 similar situations in Northern New Jersey. Mr. Austin has also sent me specimens 

 collected in Canada West. 



li. fluTiatilis, Ao. 



L. simplex vel parce ramosa, quatuor nncias longa (interdum spithamea?), recta vel subrecta ; 

 nodulis subremotis, papillis verticillatis magnis obssesis ; sporis globosis vel subellipticisj 



Z)tam.— Spor. Tsinnr"— tAW- 



Syn. — L. fiumatilis, Agakdh. Rabenhoest, Flora Europ. Algarum, Sect. III. p. 411. 



Edb. — In rivulis, Alabama ; T. M. Peters. 



Simple or sparsely branched, 4 inches long (sometimes growing of a span length ?), straight or 

 nearly so ; nodules rather distant, papillas verticillate, large, prominent. 



Remarhs. — The only specimens I have seen of this species were sent me by 

 Prof. Ravenel. This plant is larger and heavier than L. torulosa, from which it is- 

 also readily distinguished by its very large prominent papillae. These are in 

 slightly irregular whorls of three or more. The spores vary in shape from that 

 of a globe to that of a somewhat four-sided ellipse ; in the latter case being some- 

 times nearly twice as long as broad. Prof Rabenhorst speaks of the plant attain- 

 ing the length of a span. I have never seen it over four inches. 



li. catenata, Ktz. 



L. ad uneias 5 longa, regulariter constricta, simplex, compressa, arcuata, in massa obscure 

 violacea ; papillis nuUis ; sporis enormiter ovalibus vel subglobosis. 



Diam — Spor. transv. max. t^VW = -0''1"- 



Syn.—L. catenata, KUtzing. Rabenhorst. Flora Europ. Algarum, Sec. III. p. 412. 



