FUKS n -\Y.\TI-: i: AI.U.I: oi TIN: UNITED BTAT1 19 



;ililc to identif) tin- ^|>< < -ir- pi'siti\i-I\. hut li;i\<- ivfrrn-d it \vitli doubt to ft. /';'//<//- 

 chii. 



'J, pi. 1, represents tin- mil nf a filament. 



O. uigra, VAI I-H. 



1 ' ' ruto plus niiiiu-! fiinipucto, aiii]il.>. plrruinquc iiatniitr, atro-viride, cum rodiia longie ; trirlio- 

 in:itiiiiis p!rruin<|iif lli-MiuM.s; npicr .>litii-r mi uiiilatu ; urtiriilis diauielro I plo brevioribus; 

 -rpiiuciilis di.stinrtt- gruiiululN ; r\ iioplaMuatu pullidu ta'sio. 



lum. si'oa" lo'oo"- 



IMi. In fossis stu^nis prupr Phil;ulr!|iliia. 



Strntuni in. .re or Irss compart, aniplr, l>rail, mostly floating, blnckMi-grcrn, with long radii ; 

 filamfiits innstly ll'\ii'>us; npin-s nliiii-cly rouiiil.-<l; joints j shorter tliun l)road ; dissepi- 

 ments ili.-tini-tly frranuliiti'; rytinplusm paJe-grayish. 



lt< murk* Tliis sjM-cirs is foU7i<l in tliick, rathrr loose strata, floating, especially 

 \vlifii old. mi stagnant waters, or adhering to plants, &c., or the muddy shores and 

 bottom of ditches, lo>d aquaria, fcc. The color of tlie stratum is a very dark 

 l)I.icki>h-green, with a ]>ee\diar. L'l"-->. repid-ive appearance. The single filaments 

 are iif a pale-liluMi neutral tint, sometimes a little greenish, very much curved 

 and entangled, or more rarely straightish. Their motion is active. The measure- 

 ments do not quite equal those given by European authorities, but otherwise the 

 plant agrees \vrll with their descriptions. 



l-'i:,'. on, pi. 1, n IIIVM iits the mass of the plant as seen with flic naked eye; fig. 

 :;/-, shows a number of filaments slightly magnified; fig. Ic, a broken portion of a 

 filament magnified '.Ml diameters, with the sheath projecting beyond the cndo- 

 eliioiiie; fig. !/, the end of a filament still more highly magnified. 



O. limoxa. A.. MIL n. 



0. trichomatilms subripidis ct subrcctis, vividc oscillantibns, cscrnlco-viridibus, in stratum muco- 

 suni ln?tc saturate viridc ct nmdicc longc radians ct natans collectis ct intcrtoxtis, diatincte 

 arliculiitis; artieulis diamctro sulucqiialibiit. interdnra dnplo brcvioribns (post divisionem), 

 ad pcnirulu distinctc coiistrirtis ; dissi-pimcntia baud granulatis ; apiculo obtuso, baud atten- 

 nato, interdum recto, intcrdum rurvato ; cytioplasmate granulato. 



Hub. In stagnis propc Camden, New Jersey. 



Filaments straigbtish and soraewbat rigid, yividly oscillating, bluish-green, interwoven into a 

 bluish-green, floating stratum, with moderately long radii, distinctly articulate; articles about 

 equal to the diameter, or after division one-half shorter, at the joints distinctly constricted ; 

 dissepiments not granulate; apices obtuse, not attenuate, sometimes straight, sometimes 

 curved; cytioplasm granulate. 



Remark*. I have found this species floating on foul ditches near Kaighn's 

 Point, New Jersey, in the month of May. The color of the stratum is a very pure 

 deepgrcen; the single filaments vary from a rather bright deep-green to a pale blue- 

 green, according to the power under which they are seen. The apices are not at all 

 attenuate. The constriction at the articles is scarcely visible with a lower power than 

 The stratum is rather thin, with a good deal of dirt adhering to its bottom. 



