NEMALEON. 153 



common. Frond 312 inches high, fine rose-red, of a lanceolate outline, 

 much branched in a repeatedly pinnate manner, the main branches often a 

 line in diameter, ramuli very slender ; the branches and ramuli generally 

 opposite, much attenuated at base and apex. Axis, according to Capt. 

 Carmichael, tubular, the walls of the tube composed of jointed, longitudi- 

 nal, interwoven fibres ; the surface of extremely minute, dichotomous, ra- 

 diating filaments. Fructification : large dense masses of spores, scattered 

 among the filaments of the periphery. 



XIX. NEMALEON. Targioni. [Plate 21, B.] 



Frond cylindrical, gelatinoso-cartilaginous, elastic, solid ; 

 the axis columnar, dense, composed of closely packed, lon- 

 gitudinal, interlaced filaments ; the periphery of elongated, 

 horizontal, dichotomous filaments, whose ultimate ramuli 

 are moniliform and coloured. Fructification : globular 

 masses of spores (favellidia) attached to the filaments of 

 the periphery. Name, from vupa, a thread, and Xniov, a crop ; 

 crop of threads. 



1. N. multifidum. Web. & Mohr; frond dichotomous, 

 slightly branched ; dull purple, elastic ; the axils rounded. 

 Harv. Phyc. Brit. t. xxxvi. Mesogloia multifida, Hook. 

 Br. Fl. ii. p. 385 ; Berk. Alg. t. 16,/ 1 ; Wyatt, Alg. Damn. 

 No. 98. 



On shells and stones near low-water mark, not unfrequent. All round 

 the coast. Fronds of a dull purplish brown colour, 3 6 inches high, 1 2 

 lines in diameter, sub-simple or once or twice dichotomous, sometimes 

 irregularly branched, very elastic. Axis much denser than in the follow- 

 ing, not clearly filamentous, but rather, as Capt. Carmichael expresses it, 

 " a medullary cord.'' 



2. N. purpureum, Harv. ; stem undivided, attenuated at 

 base and apex, set with numerous alternate, distichous, elon- 

 gated, simple, attenuated branches, which are nearly desti- 

 tute of ramuli. Harv. Phyc. Brit. t. clxi. Mesogloia pur- 

 purea, Harv. in Hook. Br. Fl. ii. p. 386; Wyatt, Alg. 

 Danm. No. 47. 



On stones, &c., in the sea, at extreme low-water mark, very rare. Sid- 

 mouth and Torbay, Mrs. Griffiths and Miss Cutler. West of Ireland, W. 

 H. H. Fronds from a foot to 2 feet high, the main stem 2 or 3 lines in 

 diameter, undivided, alternately branched ; the branches patent, sub-hori- 

 zontal, long, flexuous, simple, either bare of ramuli or furnished with a 

 second series similar to themselves, all much attenuated towards the extre- 

 mity and somewhat tapering at base. Colour a fine purple red, which is 

 given out to fresh water; substance tender and gelatinous, slippery to the 

 touch. Axis composed of laxly interwoven, colourless, branching, longi- 

 tudinal threads, which throw out on all sides to the circumference horizon- 

 tal, dichotomous, coloured, moniliform filaments. Under the microscope 



