CONFERVACEtE. 91 



by which I can distinguish its threads from British specimens of C. Carmichaelii. It 

 is very luxuriant, of a bright green colour, and quite resembles the ordinary marine 

 form. Quere, are two species confounded ? Or is there an error in the habitat ? Or 

 does this plant inhabit both salt and fresh water, as Bangia fuscopurpurea is well known 

 to do ? 



5. HoRMOTRiciiUM ? Wormskioldu, Fl. Dan. ; filaments " branched at the base" 

 (Lyngb.) ; thence simple, erect, straight, ultra-setaceous, flaccid, bright yellow-green, 

 moniliform ; articulations at first nearly cylindrical and rather longer than broad, then 

 globular, and very much contracted at the nodes. Conferva Wormskioldii. Fl. Dan. 

 t. 1547. Lyngb. Hyd. Dan. p. 158.^. 55. A. Ag. Syst. p. 121. Hormotrichum 

 Wormskioldii, Kiitz. Sp. Alg. p. 383. Chcetomorpha monilis, Harv. in Herb, (olim.) 



Hab. Coast of Greenland, common, Wormskiold. Fragments dredged in Queen's 

 Channel, lat. 76° 29', long. 96° 13' W. Dr. Lyall. (v. s.) 



Dr. Ly all's specimens, which alone I have seen, consist of a few single threads (broken 

 branches ?) 6-8 inches long, as thick as hog's bristle or a little thicker, moniliform, 

 with very turgid globular articulations and strongly contracted dissepiments. These 

 fragments so strongly resemble the figure given by Lyngbye, (t. 55. A. 5.) that I cannot 

 doubt the above reference ; but I do question the propriety of arranging this species 

 under the present genus. I follow KUtzing, however, who had probably seen more 

 perfect specimens than I possess. Judging from the fragments collected by Dr. Lyall, 

 I formerly placed it in Choetomorpha, near C. melagonium, believing that it was an 

 undescribed species. 



Lyngbye's description may be thus rendered : " Filaments densely tufted, parallelly 

 floating, an ell or more in length, branched at the base, slender, as thick as human 

 hair (below ?), then increasing to the thickness of hog's bristle, or sparrow's quill, 

 simple, attenuated toward the apex. Articulations as long as broad, in the thicker 

 filaments remarkably moniliform, ellipsoidal or globose, turgid ; in the more slender 

 filaments often twice as long as broad. Dissepiments contracted, mostly pellucid. 

 Colour green. Substance membranaceous, tendei', lubricous, soft. It adheres to paper." 



VI. EHIZOCLONIUM, Kiitz. 



Filaments (not gelatinous) membranaceous, uniform in diameter throughout, decum- 

 bent, simple or spuriously branched ; branches short and rootlike ; formed of a string 

 of oblong cells. Cell-wall thin. Articulations filled with granular endochrome. 

 (Marine, or in fresh water, or on damp ground.) 



