Ser. CHLOROSPERMER. Pam. Siphonee. 
PLATE XCIIL. 
CODIUM TOMENTOSUM, Stack. 
Gen. Cuan. Frond green, sponge-like (globular, cylindrical or flat; simple 
or branched), composed of tubular, interwoven, inarticulate filaments 
(elongated, branching cells). Fructification; opake vesicles (conio- 
cyst) attached to the filaments. Coprum (Stack.),—from x@diov, the 
skin of an animal. 
Copium fomentosum; frond linear, dichotomous, cylindrical or compressed. 
Copium tomentosum, Stack. Ag. Sp. Alg. vol.i. p. 452, Ag. Syst. p. 177. 
Spreng. Syst. Veg. vol. iv. p. 365. Grev. Alg. Brit. p.185.t.19. Hook. 
Brit. #1. vol. ii. p. 318. Harv. in Mack. Fl. Hib. part 3. p. 282. Harv. 
Man. p. 145. Wyatt, Alg. Danm. no.35. J. Ag. Alg. Medit. p. 23. 
Endl. 3rd Suppl. p.21. Kiitz. Phyc. Gen. p. 309. t. 42. f. 3. Montg. 
Canar. Crypt. p. 182. Pol. Leed. p. 35, Alger. p. 48. 
Coprum elongatum, 4y. Sp. Alg. vol. i. p. 454. Ag. Syst. p. 177. Endl. 
3rd Suppl. p.21. Monty. Alger. p. 50. t. 13. f. 1. 
Coprum lineare? 4g. 1. c. 
Coprum filiforme? Monty. Alger. p. 50. t. 10. f. 2. 
Sponcopium tomentosum, Lamour. Ess. p. 73. 
Sponcoprum commune, Bory, Dup. Voy. Bot. p. 210. 
Fucus tomentosus, Huds. Fl, Ang. p.514. Stack. Ner. Brit.t.7. Good. 
and Woodw. in Linn. Trans. vol. ii. p.195. EH. Bot. t. 712. Esper, Fuc. 
t.112. Turn. Syn. vol. ii. p. 300. Hist. t. 135. 
Acarpuia dichotoma, areolata, et ramentacea, Cabrera, in Phys. Sédllsk. 
Arsbher. 
Has. On rocks in the sea, within the range of the tide; generally near 
low-water mark. Perennial. Summer. Common on the rocky shores 
of the British Islands. 
Groar. Distr. Common on all the shores of Europe, both Mediterranean and 
Atlantic. Dispersed also throughout the temperate and torrid portions 
of the Atlantic, Pacific, and Indian Oceans. New Holland and Tasmania. 
Auckland Islands. 
Descr. Fronds rising from an expanded velvety incrustation, which forms wide 
patches on the surface of rocks, solitary, or gregarious, from six inches to 
two feet in length, from two to four lines in diameter at the base, erect, 
more or less regularly dichotomous, with or without lateral ramuli. 
Branches cylindrical or frequently compressed, linear, obtuse, often expanded, 
sometimes greatly so, beneath the forkings. dzi/s rounded. The whole 
frond is coated with delicate, hyaline, horizontal filaments, one or two lines 
in length, and of a very soft and gelatinous substance. Structure; the 
axis is composed of innumerable, interwoven, irregularly branched, slender 
filaments, from which issue radiating, horizontal, somewhat clavate ramuli, 
whose apices constitute the surface of the frond. To the sides of these 
ramuli are attached the ovato-lanceolate subsessile coniocyste, which contain 
