FK i:s ii \\.\r I:K \i.t;.i: u r n i: i \ i i I:D STATES. 57 



second rla^s of ch;ir;ictiTs an- those di-co\c ralilc only with tin- higher powers. 

 The\ an- divisil.le into t\*o-et,; thoM- afforded \>\ the inner tilanicnt and those 

 derhed from tin- sheaths. In the first of these the joints tube noted arc, the 

 diameter of the filament ; its color, whether it lie or he not articulated, and if it 

 lx- the length of the joints; whether it is uniform or moniliform ; whether it bo 

 homogeneous or granulate ; then the heteroc\sts should In- examined as to their 

 si/e, position, arrangement, shape, numher, and color. 



The diameter of the sheath, its honio^encousness, its color, firmness, and the 

 condition of its outer surface an- to he included in the specific study. 



usSCYTOM.M \. 



Trii li.'inataca>spitos<wonprognta vel faaciculata, plus minus pgrodornmosa, rellulis interstitialibui 

 in-iru.-tii ; vigiiite gclatinoso-menibranacea, e strati.-, (interdum obsolctis) pluribus cylindraceis com- 



I'llulis pvriluraiitibiix singulis. 



Filaments cwspitoscly-congn-irafr or fasciculate, more or less psendoraraosc ; furnished with in- 

 irrUtinou.^-uiriiibranaceous, composed of many cylindrical, sometimes ob- 

 Milrtr. .-.tratu; lii'tcrocysts single. 



a. Terrestrc* vel aquatic f. 



(i. ']' >! .-'rial or aq\i" 



. .in:pli . \\ ..OB, (sp. nov.) 



: si rat o mod ice crasso, subtomcntoso, nipro-viridc ; trichoraatibas valde clongatis, flczaofto- 

 rurratis, parcissimc pscudoramosis vel sa-pe sine pseudoramulis; pseudoramulis geminis vel 

 sinfrulis, [ilrniiuque clongatis; trichomatibus internis modo distincte articulatis, modo inar- 

 tii-uititis. ii|.ii-i- iiitrriluni l>revissime articulatis, granulosis, pallidc viridibus, ad genicula sa^pc 

 nodosis vel disjunctis, articulia plerumquc diametro a?qualibus ad 7 plo longioribus; vaginis 

 ]ilcnini(|iic supra trnncatis et apertis, pellucidis, etepe colons expcrtibus, interdum dilute 

 aurou-brunnois; cellulis purclurautibus cylindricis, intcrjectis, diametro 2-5 plo longioribus. 



Diam. Trich. cam vag W' uW - -0004" OOOG6"; sine vag. T ^o" rA" -00013" 

 .000-2f,' 



H,,h In lignis irroretis, South Carolina. (Ravcnel.) 



S. in a moderately thick, somewhat tomcntose, blackish-green stratum; trichomata very elongate, 

 flcxuonsly curved, verj- sparsely branched or frequently without branches ; branches geminate 

 or single, mostly elongate ; internal filament partly distinctly articulate, partly inarticulate, 

 granular, pale-greenish, in its apex sometimes very shortly articulate, sparsely granular, 

 often nodose or disjoined at the joints; articles mostly from equal to to 7 times longer than 

 the diameter; sheaths thick, transparent, often colorless, sometimes pale yellowish-brown, 

 mostly open and truncate at apex ; heterocysts cylindrical, interspersed, 2-5 times longer 

 than their diameter. 



Remark*. I am indebted to Professor Ravenel for specimens of this species. 

 They are preserved in solution of acetate of alumina and accompanied by the fol- 

 lowing label : " Adhering to the wet sides of a wooden gutter, leading water from 

 a spring, September 29, 1869: Aiken, South Carolina." The filaments are 

 remarkable for the fewness of their branches. Generally, indeed, there are no 



8 lUy. 1871 



