208 CONFERVA. 



least laceration. Filaments 5 or 6 inches long, about the thickness of C. 

 bombi/cina, ri^id, possessed of peculiar roughness ; feeling, when pulled 

 asunder, as if hair were drawn over a piece of rosin. Articulatiims 3 — 4 

 times as long as broad ; sporular mass assuming a great variety of forms. 

 When old the filaments become exceedingly rough and often tubercular.'' 

 Carrri: 



3. C. Utorea, Haw. ; filaments thick, rigid, crisped, form- 

 ing loose, extensive bundles of a dull green colour ; articula- 

 tions once and a half as long as broad. C. limim, Harv. in 

 Hook. Br. FL ii. p. 352, (not of Roth). Wyatt, Alij. Danm. 

 No. 220. 



In salt-water ditches, along the muddy sea shore. — " Forming distinct, 

 loosely interwoven, sub-cylindrical tufts of a yellowish green colour, which, 

 in a more advanced state, changes to a dark olive ; attached at one end, 

 and resting at the bottom of the pool. Filaments as thick as those of C. 

 cerea, rigid, brittle, and variously curved. Articulations filled with green 

 matter, intermixed with large granules, irregularly contracted and com- 

 pressed in drying.'' Carm. MS. This plant was called C. Linum in ' Brit. 

 Flora' on the authority of Capt. Carmichael, but that name having now 

 been ascertained to belong to the following species, it becomes necessary 

 to assign a new name to the present one. 



4. C. Linum, Roth ; filaments very tliick, of great length, 

 deep glossy green, much curled, rigid, forming loosely en- 

 tangled, harsh masses ; articulations as long as broad. C. 

 crassa, Ag., Harv. I. c. j)- ^^~- Conf. capiUaris, Dillw. t. 

 9 ; Harv. Phyc. Brit. t. cl. A. 



In salt-water ditches, near the coast. Very abundant in the ditches by 

 the North Wall, Dublin. — Filaments many feet long, twice as thick as 

 hogs' bristles, remarkably rigid and fragile when recent, but soon becoming 

 flaccid on exposure to the air. Tliis is the true C. Linum of Roth, see 

 Phyc. Brit. 



5. C. sutoria, Berk. ; threads setaceous, extremely long, 



flexuous, equal, dark green ; articulations once and a half as 



long as broad; interstices pellucid. Berk. Gl. Alg. t. 14,/. 



3 ; Harv. Phyc. Brit. t. cl. B. 



Floating in ditches and pools subject to the influence of the tide, at 

 Wisbeach, Rev. M. J. Berkelci/. April. Near C. Linum and C. crassa, 

 " from both which, however, it differs in being a much more slender plant, 

 and of a closer habit, and by no means variegated." Berk. 



6. C. tortuosa, Dillw. ; filaments rigid, slender, much 

 curled and twisted, forming broad, closely interwoven strata ; 

 articulations 2 or 3 limes longer than broad. Harv. I. c. p. 

 352 ; Dillw. t. 46. 



In the sea, on rocks and Alga; ; common. — This forms extensive strata, 



