Ser. MELANOSPERMEiE. { 101 ) Fam. DICTYOTEiE. 



Plate CLXVI. 

 ASPEEOCOCCUS ECHINATUS.— G^ree?. 



Gen. Chak. — Frond membranaceous, simple, tubular, cylindrical or compressed. Fructi- 

 fication : external, minute, roundisb ovate spores collected in little groups or sori, 

 mixed abundantly with club-shaped filaments, and scattered over the whole surface 

 of the frond. Name improperly formed from the Latin asper, "rough," and the 

 Greek kokkos, " fruit," in allusion to the loughness formed on the surface by the 

 fructification. 



AsPERococcus echinatus. — Frond tubular, cyliudiical, acute, much 

 attenuated towards the base, often contorted. 



AsPEROCOccirs echinatus. — Grev. Alg. Brit. p. 50, t. 9 ; Endl. 3rd Suppl, p. 26 ; 

 Harv. P. B. plate 194 ; Harv. Man. p. 43 ; Harv. Syn. p. 38 ; 

 Atlas, plate 12, fig. iQ;Harv. N. B. A. part 1, p. 117; /. G. Agardh, 

 Sp. Gen. Alg. vol. i. p. 76. 



AsPEROcocCTs fistulosus. — HooTc. Br. Fl. vol. ii. p. 277 ; Wyatt, Alg. Danm. 

 No. 7 ; Harv. in Mack Fl. Hib. part 3, p. 175. 



AsPEROcoccus rugosus. — Lamour. Ess. p. 62. 



Encjslium echinatum. — Ag. Sp. Alg. vol. i. p. 145; Ag. Syst. p. 261; Spreng. 

 Syst. Veg. vol. iv. p. 328 ; Kiitz. Phyc. Gen. p. 336. 



Encsilium Lynglyanum. — Grev. Crypt, t. 290. 



ScYTOSiPHON filum, Ya,v. fistulosum. — Ag. Sp. vol. i. p. 163; Ag. Syst. p. 258. 



Ulva fistulosa.—Hwds. Fl. Angl. p. 569 ; E. Bot. t. 642 ; EooL Fl. Scot. 

 part 2, p. 92. 



Conferva fistula. — Roth, Cat. Bot. vol. iii. p. 169. 



Var. ^. — Frond setaceous, filiform, twisted. 



AsPEROCOcctrs echinatus, j8 vermicularis. — Harv. P. B. plate 194 ; Han. Man. 

 p. 43 ; /. G. Agardh, Sp. Gen. Alg. vol. i. p. 76. 



Asperocococs vermicularis. — Moore, Ord. Surv. Londonderry, Bot. p. 9 ; Wyatt, 

 Alg. Danm. No. 207. 

 Hab. — On stones, shells, &c., between tide marks. Annual. Spring, summer and 

 autumn. Common on the British shores. 



Geoqr. Dist. — Atlantic coasts of Europe and America; Southern Ocean at Lord 

 Auckland's Islands {Dr. Hooher). 



Description. — Root, a minute disc. Frond from a slender cyhndri- 

 cal base, gradually thickened to about one-third from the apex, then 

 tapering to a rather acute point, veiy much tufted, eight to twelve 



