FRESH- WATER ALG.E OF THE UNITED STATES 223 



I. inriilc>*a. (KoTii) Ao. 



L. subsimplrx, pi. TUMI. (in- arcuata, cartilaginea et nonuiliil rigida, 1-2 poll ices longa; nodulis 

 upproximuli.s, pupillis u|>|)lunutis, plcruiuque 4-6 enormitcr vurticcllutis, vcl nonnihil spars!*, 

 iuicnlinii noiinihil ri.ntliu-iiiiliu.- ; sporis uvaiibus. 



2>iam. Sporis. transv. max. T ,J,," rf& v ". 



.S'J/H. L. turulvsa (Rorii) Ao. RABEMIORST, Flora: Europ. Algarum, Sect. III. p. 411. 



Ilab. In fluininc, Kentucky; (Short) Harvey. Pennsylvania; Virginia; New York; New 



Jersey ; \V<x>U. 



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

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

 scattered, sometimes slightly confluent; spores oval. 



/,' i/iu i-l.-x. 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 u'raxMi groundwork, with a dark band at the position of the nodes, which are 

 enlarged and 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 

 Si hnylkill, just above Flat Rock Tunnel, on the Heading Railroad, eight or nine 

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

 himself 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. 



L. flut iatiliv Ao. 



L. simplex vcl parce ramosa, quatuor nnciaa longa (interdum spithameaf), recta vel subrccta ; 

 nodulis subremotis, pupillis verticillatis uiagnis obssesis; sporis globosis vel subellipticis. 



Diam. Spor. WoV rVoW- 



,s'_i/i. L. jlutiatilis, AUARDII. RABENUORST, Flora Europ. Algarnm, Sect III. p. 411. 



Unli. 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, papilla) verticillate, large, prominent. 



Remarks. 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. 



L. catenata, KTZ. 



L. ad uncias 5 longa, regulariter constricta, simplex, compressa, arcnata, in massa obscure 

 violacca ; papillis nullis ; sporis enormiter ovalibus vel subglobosis. 



Diam Spor. transv. max y^cre" = - 001 "- 



Syn. L. catenata, KVJTZINU. RABENHORST, Flora Europ. Algarnm, Sec. III. p. 412. 



