354 ALGjE CONFERVOIDEyE. [Conferva. 



20 C. cerea, Dillw. (harsh verdigris Conferva); filaments 

 elongated tufted straight harsh brittle yellow-green, articula- 

 tions as long as broad. — Dillw. Conf. t. 80. E. Bot. t. 1929. 

 Ag. Syst. Alg. p. 100. 



In the sea, on sand-covered rocks, common in many places. — Fila- 

 ments 3 — 12 inches long, tufted, as thick as hog's bristle, harsh to the 

 touch, of a beautiful yellow-green colour, fading in the herbarium to a 

 dirty white. Endochrome finally bipartite. The articulations are visi- 

 ble to the naked eye. 



21. C colldbens, Ag. (flaccid verdigris Conferva); filaments 

 elongated straight tufted very thick gelatinous and flaccid, of a 

 splendid seruginose green, articulations once and a half as long 



as broad Ag. Syst. Alg. p. 102. — C cerea, (3. lubrica, Dillw 



Conf. Syn. p. 48. 



At Yarmouth, on a floating piece of deal, Dr. Hooker. — Filaments 

 3 — 4 inches long, twice as thick as in C. cerea, of a splendid aeruginose 

 green colour, which is fully preserved in drying, very gelatinous, adher- 

 ing most closely to paper; dissepiments much contracted. A highly 

 beautiful plant ; very distinct in my opinion from C. cerea, with which 

 Dillwyn has confounded it. 



22. C. Yoimgdna, Dillw. (Mr. Young's Conferva); filaments 

 short tufted straight bright-green somewhat rigid, articulations 

 once or twice as long as broad, dissepiments finally contracted. 

 —Dillw. Conf. t. 102. Ag. Syst. Alg. p. 101.— C. isogona, 

 E. Bot. t. 1930. 



On rocks, &c, near high-water mark ; first discovered by Mr. W. W. 

 Younv, on rocks near Dunraven Castle, Glamorgan. — Filaments an inch 

 lon-T, forming small tufts, somewhat rigid (as compared with C. collabens), 

 obtuse. Articulations variable. 



23. Cfldcca, Dillw. (small flaccid Conferva); filaments short 

 tufted straight bright-green flaccid, articulations half as long as 



broad Dillw. Conf. t. 49. E. Bot. i. 1943. Ag. Syst. Alg. 



p. 102. 



On Fuci, or floating timber. — Filaments half an inch to an inch long; 

 forming broad, bright-green tufts. It adheres closely to paper. 



e. Filaments rising from disciform tubercles and forming 'pencil- 

 like tufts, olivaceous, marine, parasitical. 



24. C. fucicola, Velley, (large parasitic Conferva) ; fila- 

 ments rising from a minute tubercle penicillate flaccid mem- 

 branaceous, articulations about twice as long as broad.— Velley, 

 Alg. t. 4. Dillw. Conf. t. 66. Lyngb. Hydroph. Dan. t. 50 — C. 

 ferruginea, Both. — Ag. Syst. Alg. p. 103. — C. fucicola, Ag. 



Syst. Alg. p. 103. 



On Fuci, especially F. nodosus and vesieulosus ; common. — " Fila- 

 ments branched at the base, within the tubercle. Tubercles variable in 

 size ; in tufts of the first year hardly perceptible,— from this period they 

 increase by degrees, until at length they become globular, with a slen- 



