Ectocarpus.] ALG^ MELANOSPERME/E. 181 



On various marine Algas, very common. Tufts half an inch to an 

 inch or two in height, olive-brown. 



5. S. radicans, Harv. Creeping Sphacelaria. Filaments 

 decumbent, sending out fibrous radicles in the lower part, with 

 a few irregular, simple, straight, naked branches. Harv. in 

 Hook. Br. Fl. v. ii. p. 324. Conf. radiccvis, Dillw. Lyn. p. 57. 

 t. C. E. Bot. t. 2138. 



Sand covered rocks. Bantry bay; Miss Hutchins. A very 

 doubtful species. 



G. S. olivacea, Ag. Olive Sphacelaria. Filaments short, 

 erect, tufted, sparingly branched; branches alternate, simple. 

 Harv. in Hook. Br. Fl. v. ii. p. 235.— Conf. olivacea. E. Bot. 

 t. 2172. 



On rocks, and the larger Algae. Dunmore ; Miss A. Taylor. 



7. S. velutina, Grev. Velvet-like Sphacelaria. " Oliva- 

 ceous, spreading, velvet-like; filaments subsimple, erect, very 

 short, bearing capsules at the base, joints about equal in 

 length and breadth." Grev. Crypt. Fl. t. 350. Harv. in Hook. 

 Br. Fl. v. ii. p. 325. 



Farasitical on Himanthalia lorea. Filaments about a line in 

 height, forming velvetty patches. It has but a very feeble claim to be 

 considered a member of" the present genus, and would, in my opinion, 

 range much better with Myrionema. 



22. Ectocarpus. Lyngb. Ectocarpus. 



Filaments capillary, olivaceous or brown, flaccid, without lon- 

 gitudinal striae. Fruit, sphserical or siliquaeform capsules and 

 granules in swollen ramuli. — Name ; cktos, Kapwos, external 

 fruit ; equally applicable to many other genera. 



1 . E. littoralis, Lyngb. Common Ectocarpus. Filaments 

 densely tufted, excessively branched; ultimate ramuli some- 

 what patent, alternate or fascicled ; capsules sphaerical, sessile. 

 Harv. in Hook. Br. Fl. v. ii. p. 325.— Conf. litt. E. Bot. 

 t. 2290. 



On the larger Algae, very common. Tufts 1 — G inches long, brown, 

 euarse. 



2. E. siliculosus, Lyngb. Bod-fruited Ectocarpus. Fila- 

 ments flaccid and slender, tufted ; ultimate ramuli erect, subu- 

 late, alternate or fascicled, capsules siliquaeform, lanceolate. 

 Harv. in Hook. Br. El. v. ii. p. 325. — Conf. silic. E. Bot. 

 t. 2319. 



Sea-shores, on Algae, corallines, &c. 2 — 12 inches high, pale yellow, 

 distinguished by the siliquaeform fruit. 



3. E. tomentosus, Lyngb. Woolly Ectocarpus. Filaments 

 rlexuosc, very slender, woven into a dense sponge-like branch- 



