Rusariu.} ALG.li CONFERVOIDJi.t. 071 



In small mud-bottomed pools, near the sea-shore, filled at Sj)ring-tides. 

 Apj)in, Capt. Carmichael.—" Stratum exceedingly thin end lax, exten- 

 sive, at first of a vivid-green colour, but passing gradually into a pale 

 chestnut." Cartn. — Filaments an inch long, flaccid, bent in various 

 curves, but scarcely tortuous, of a pale verdigris colour under the mi- 

 croscope; striae rather evident and subdistant. Capt. Carmichael's plant 

 is of a dull-verdigris hue, without gloss. I have compared it with an 

 authentic specimen from Agardh, and can detect no difference, except 

 in colour, which, according to Carmichael, varies with the age of the 

 individual. Agardh's /3. appears to answ er the British plant very exactly. 



5. L. Carmichaelii, Harv. {Capt. Carmichael 's Lynybya); fila- 

 ments very long thickish curled and tortuous cylindrical floating 

 under water and forming- extensive grass-green strata. — L. 

 crisjxi, Car m. M SS. cum ic. (not of Agardh.) 



Marine rocks and Fuci. Appin, Capt. Carmichael. — " Stratum almost 

 co-extensive with the object on which it grows. On Fucus vcsiculosus 

 it may be found upwards of a foot in extent, on the rocks, of -20—30 

 yards, covering them with an intensely green fleece. Filament* fixed at 

 the base, but fluctuating freely with the agitation of the water; several 

 inches long, flaccid, at length becoming curled and convoluted, when 

 the sporidia, bursting through the tube, leave it partially empty and 

 pellucid." Carnu — Transverse striae very evident and subdistant. When 

 dry it is of a dull green, without gloss or any glaucous or verdigris hue, 

 and, to the naked eye, strongly resembles ft rivularis. Lyngbye's figure 

 of Cunf. cui/luiia would correspond with it very well; but the description 

 does not. 



6. L. speciosa, Carm. (beautiful Lynybya); filaments long 

 thick flaccid straight at length curled, the margin eremite, freely 

 floating in the water and forming extensive bright-green strata. 

 — Car/.'!. MSS. cum ic. 



Marine rocks and Fuci. A ppin, Captain Carmichael. — " This plant 

 covers the whole surface of the rock or stone, floating loosely in the 

 water; but, when left by the tide, spreading over it in a thin intensely 

 The filaments are twice as thick as those of the former 

 specie-, 3 — 4 inches long, straight and flaccid, at length becoming curled and 

 crenated by the marginal protrusion of the sporidia. These are of a very 

 Hat lenticular form, and when ripe burst through the sides of the tube, 

 leaving it here and there colourless." <. . MSS. When dry, it i> 



of a dl 



75. RosAria. Carm. Rosaria. 



Filaments continuous, tubular, Loculoso-contracted at equal 

 distances. Loculi containing two sporidia. — Name: rosarium, 

 //"i- string of bead- — Capt. Carmichael, in proposing 

 thii genus, remarks, " The very minute plants which 1 h 

 referred to this genus i » been described before : perhaps 



they are to be found in the genus Fragilaria of Lyngbye and 

 Meloseira of Agardh ; but I confess I cannot identify eithei 

 them with any of the specie* described by these authors. To 

 be admissible into either of these genera, the filaments ought to 

 he plane and articulated; but, from tin- most minute in- 



