140 SIPHOPHYCEJ2. 



. 



" Filaments several inches to a foot or more in length, as thick aa 

 hog's bristle, variously carved and twisted, forming extensive, loosely 

 packed bundles or strata which fill the pools in which they grow. .Arti- 

 culations once and a-half as long as broad, filled with a dark green fluid, 

 at length separating by a transverse medial line into two poi'tions, which 

 eventually become separate joints. Colour dark green, not variegated. 

 Substance rigid, not adhering to paper in drying." Harvey. 



Plate LIV. fig. 5. Portion of base of thread of Ch&tomorplia 

 sutoria X 100. 



Chaetomorpha implexa. (Dell.) Kutz. Tab. in., t. 51, /. 3. 



Pale or deep yellowish green, crispate, interwoven in lax 

 tufts, rather rigid, sometimes mucous, articulations before 

 division twice as long as the diameter ; cell-membrane rather 

 thick, indistinctly lamellose, after application of concentrated 

 sulphuric acid at first homogeneous, but after four hours' action 

 manifestly striate-lamellose. 



SIZE. Threads, '04-'06 mm. diam. 



Rabh. Alg. Eur. iii., 329. 



Conferva implexa, Dillw. Conf., t. B. Ag. Syst. p. 91. 



Conferva sutoria, Crouan, Fl. Fin. 



In brackish and salt water. 



" Filaments forming densely interwoven strata, or tufts among the 

 branches of other Algao. Joints even, in the same thread varying from 

 a little shorter than their breadth to about once and a-half as long. 

 Colour a dark grass green." Harvey.^ 



Plate LIV. fg. 6. Portions of threads of Clicetomorplia implexa X 

 200. 



GENUS 61. RHIZOCLONXU1K. Kiitz. (1843.) 



Articulate thread the same as in Conferva, but distinctly 

 contorted, and forming by prolification of the cells short root- 

 like processes. 



Propagation unknown. 



Rhizoclonium Caspaxyi. Harv. PTiy. Britt., t. 354, B. 



Filaments elongated, slender, decumbent, pale yellow green, 

 stratified, interwoven, curved here and there, and angularly bent, 

 at the angles emitting short root-like branches, which some- 

 times lengthen, and are filled with endochrome; articulations 

 2 to 6 times longer than broad, with narrow dissepiments and 

 granular endochrome. 



SIZE. Threads -018--025 mm. 



Rabh. Alg. Eur. iii., 330. 



In brackish and salt water. 



" Forming a thin web of a bright green colour and considerable extent. 

 Filaments elongate, gracefully curve! rather than twisted, interwoven, 

 here and there angularly bent. At the angle issues a root-like process, 



