140 SIPHOPHYCE. 
“ Filaments several inches to a foot or more in length, as thick as 
hog’s bristle, variously curved 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 portions, 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 Chetomorpha 
sutoria % 100. 
Chetomorpha implexa. (Dell.) Kutz. Tad. m1,, ¢. 51, f.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.3. 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 Algzw. 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.3 
Plate LIV. fig. 6. Portions of threads of Chetomerpha impleza X 
200. 
GENUS 61. RHIZOCLONIUM. Kutz. (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 Casparyi. Harv. Phy. 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 curved rather than twisted, interwoven, 
here and there angularly bent. At the angle issues a root-like process, 
