Ser. Melanosperme/E. Fam. Dictyotea. 



Plate CXCIV. 



ASPEROCOCCUS ECHINATUS, Grev. 



(ten. Char. Frond unbranched, tubular, cylindrical, or rarely compressed, 

 continuous, membranaceous. Fructification scattered over the whole 

 frond, in minute, distinct dots (sori) composed of roundish, prominent 

 spores, mixed with club-shaped filaments. Asperococcus (Lanwur.), 

 corruptly formed from asper, rough, and kokkos, a fruit or seed. 



Asperococcus ec/iinatus; frond cylindrical, obtuse, or acute, much and 

 gradually attenuated to the base. 



Asperococcls echinatus, Grev. Alg. Brit. p. 50. t. 9. Harv. Man. p. 35. 

 Kndl. %rd Suppl. p. 26. 



Asperococcus fistulosus, Hook. Br. Fl. vol. ii. p. 277. Wyatt, Alg. Damn. 

 no. 7. Harv. in Mack. Fl. Hib. part 3. p. 175. 



Asperococcus rugosus, Lamour. Fss. p. 62. 



RNCffiLIUM ecliinatum, Ag. Sp. Alg. vol. i. p. 145. Ag. Syst. p. 261. Spreng. 

 Syst. Veg. vol. iv. p. 328. Kiitz. Phjc. Gen. p. 336. 



Enccelium Lyngbyanum, Grev. Crypt, t. 290. 



Scytosiphon fistulosus, Lyngb. Hyd. Ban. p. 66. 



Scytosiphon filum, var. fistulosum, Ag. Sp. vol. i. p. 163. Ag. Syst. p. 258. 



Ulva fistulosa, Huds. Fl. Aug. p. 569. E. Bot. t. 642. nook. Fl. Scot. 

 part 2. p. 92. 



Conferva fistula, Roth, Cat. Bot. vol. hi. p. 169. 



Var. |8. frond setaceous, filiform, twisted. 



Asperococcus echinatus, /3. vermicularis, Harv. Man. p. 35. 



Asperococcus vermicularis, Moore, Ord. Surv. Londonderry, Bot. p. 9. 

 Wyatt, Alg. Damn. no. 207. 



IIab. On stones, &c, between tide marks. Annual. Summer and autumn. 

 Common on the British shores. 



Geogr. Distr. Atlantic coasts of Europe and America. Southern Ocean, at 

 Lord Auckland's Islands, Br. Hooker. 



Descr. Boot, a small disc. Fronds densely tufted, from twenty to a hundred 

 growing from nearly the same point, varying from two inches to two feel 

 in length, and from half a line to half an inch in diameter, very much and 

 very gradually attenuated at the base, and more or less tapering upwards, 

 sometimes ending abruptly in a blunt point, sometimes acute, and much 

 drawn out, cylindrical, bag-like, here and there irregularly somewhat nar- 

 rowed, or slightly constricted. Fructification densely sprinkled over the 

 whole frond, forming minute, prominent, rough dots, composed of densely 

 packed, vertical filaments, among which the spores arc concealed. In a 

 young state the frond is clothed with long, pellucid fibres. Substance 

 membranaceous, soft ; when young, slimy, adhering to paper. Structure 



reticulated, the membrane composed of large, lax Cells, OoloMT oliw, more 



