i -i; i:< ii- w ATI-: u A !.<;.!: OF THI: IMTED STATES. 21 



Ilnli. In sta^nis |irojn- riiiluilcl]ihi;i. 



i ' ..-urriiig in an nliv.--l.hirk. mucous stratum, mostly swimming and with long rays; filaments 



htruijjlit or trui}:liiisli, lijjlit-frr.-rn or ilcc|i-olivc. ir;iii.|iiil, nut oscillating, but moving with a 



gliding motion ; mils M.mi-uluit attriiiiatr, l.n.iully rnundi-d or sulitruncatc, cum-d ; articles 



I liin.-.-. -h-r.i r ili.in liroinl, slightly contracted at tin- joints; cytioplasui homogeneous, 



olive-green ; .shcutLs linn, ili.-tiuetly transversely grooved at tho joints. 



/,' inn >/.-*. The strata <>f tins species are often of great extent, and resemble 

 more masses of spim^vra than of the ordinary oscillatoria. They arc very loose in 

 texture anil arc vi-ry slimy, whilst their eil^es arc fringed by the long tranquil 

 In certain conditions of growth, the endochrome of the filaments is so dense 

 ns to render them very opaque and the articulations very obscure. The sheaths 

 when emptied show the marks of the joints very distinctly ; but, at times, when 

 gorged with (\tioplasm, scan-.-ly can the sheath itself be seen. The color of the 

 filament is also affected by the state of the protoplasm, so that it varies from a 

 liijhtish-u'recn with an olive tint to a very decided dark olive. This species seems 

 ti> he closely allied to the European O. printvfM, from which, however, it differs in 

 its motion, which is always very slow and merely gliding, its color, the distance of 

 the dissepiments, and the much longer curvature of the ends. It grows everywhere 

 in the ditches around the city ; when mature, generally floating upon the surface 

 with an adherent nnder-stratum of dirt, but, in its earlier history, often adhering 



to the bottom. 



I'ig. Grt, pi. 1, is a drawing of the end of a filament; fig. 66, represents a small 

 fragment of a filament, showing the tendency to take a roundish or barrel shape; 

 much of the endochrome has been squeezed out by the injury which has broken 



the filaments. 



Genus CHTIIOXOBLASTUS, KTZ. 



Phormitlii trichomaU fasciatim congests ct vagina rommuni mncosa apice clnusa vel aperta inclusa. 

 Tales fasciculi numcrosi in stratum (quasi thulium) gclatinosum, passim araoso-dmsum aggrcgati. 

 :i8D communes achromatictc, saspe lumellosic, plus minus ampliatac, rarins indistincUe et subnulla-, 

 evacnatic, plerumque valdc intumcscentes. Trichomata Phormidii modo oscillantia, articulata et 

 vaginata, rigida, recta vel parum curvula, in fascicules funiformes plus minas dense contorta, apico 

 soluta et divaricata. Cellulas propagatorias observarc mihi contigit. (K.) 



Filaments fasciately placed together and included in a common mucous sheath with open or shot 

 apex. A number of these fasciculi aggregated in a gelatinons stratum (pseudothallus), which is 

 gelatinous, and here and there ramosely divaricate. Common sheath colorless, often lamellate, more 

 or less enlarged, rarely indistinct and nearly wanting, when empty mostly markedly intumescent. 

 Filaments oscillating like to those of Phorraidium, articulate and vaginate, rigid, straight, or a little 

 curved, more or less densely entangled into cord-like fasciculi, with the apex dissolved and dis- 

 severed. 



C'h. rrpens, KTZ. 



Ch. terrestris, strato plus minas expanse, satnnxtc aeniginpo-chalybeo aut olivaceo-fuscescente, 

 mncoso-mcmbranaceo ; trichoniatibus equalibus in fascicules filiformcs, soepe valde elon- 

 gatos, e vaginae communis apertura penieillatirn cxsertos congestis; articnlis diametro tequali- 

 lni-i disscpimcntis granulatis, apiculo obtuse recto. (R.) 



Species, mihi ignota. 



