S'H ALGiE CONFERVOIDEiE. [Sphacelaria* 



** Base of the filaments naked (ivithout stuppa). 



4. S. plumosa, Lyngb. (feathery Sphacelaria); without stuppa,. 

 filaments elongated branched inarticulate pinnate, pinnae very close 

 simple pectinated elongated erecto-patent. — Lyngb. Hydroph, 

 Dan. p. 103. t. 30. Ag. Sj). Alg. v. 2. p. 24. — Ceramium pen- 



natum, Fl. Dan. t. 1481 Conferva pe?mata, E. Bot. t. 2330 



(left-handfig.). 



South coasts of England; rare? Firth of Forth, Drs. Richardson 

 and Greville. — Filaments 2 — 4 inches high, tufted, flaccid when fresh, as 

 thick as hog's bristles, naked at the base; branches irregularly set, the 

 ultimate ones often fascicled, pinnated with very close, opposite, patent, 

 perfectly simple ramuli. 2 — 3 lines long. Colour greenish-olive. A 

 beautiful species, whose pinnated branches truly resemble delicate 

 feathers. Notwithstanding its distinct characters, it has been often 

 confounded with the following, as well as with S. disticha. 



5. S. cirrhosa, Ag. (small pinnate Sphacelaria); filaments 

 short without stuppa densely tufted articulated throughout, 

 branches alternate irregularly pinnated. — Ag. Sp.Alg. v.2.jj.27. 

 — S.pinnata, Lyngb. Hydroph. Ban. p. 105. t. 31. — Conferva 

 pinnata, Dillw. Conf t. 86. E. Bot. t. 2330, (right hand fig.) — 

 (3. cegagropila; filaments forming a dense round ball. — y. paten- 

 tissi?na ; ramuli irregular, issuing at right angles. Grev. Crypt. 

 FL t. 317. 



On Fuci and corallines, very common. — y. Shores of Bute, Dr. Gre- 

 ville. 



6. S. fusca, Ag. (brown Sphacelaria); " filaments brown," 

 branches distant sub-alternate, ramuli patent clavate, articula- 

 tions twice as long as broad, with a mesial transverse fascia, 

 —Dillw. Conf. t. 95. Ag. Sp. Alg. v. 2. p. 34. 



Shores of Wales, Dillw. — A very obscure plant, which I have never 

 seen. It is probably one of the many varieties of S. cirrhosa. 



7. S. radica?is, (creeping Sphacelaria); filaments decumbent, 

 sending out fibrous radicles in the lower part, with a few irre- 

 gular simple straight naked branches. — Conferva radicans, Dillw. 

 Conf. Syn. p. 57. t. C. E. Bot. t. 2138. — S. cirrhosa, £. simplex, 

 Ag. Sp. Alg. v. 2. p. 29. 



Sand-covered rocks, in various parts of Great Britain and Ireland ; 

 first noticed by Miss Hutchins at Bantry. — A very doubtful species. 

 " Some of my specimens bear abundance of clustered sessile capsules. 

 The E. Bot. figure is better than Dillwyn's; but the dissepiments are 

 not pellucid in the living plant. It seems a more rigid and less 

 branched plant than S. olivacea, and the joints are perhaps shorter; but 

 I am by no means certain that the two are distinct." Borr. MS. 



8. S. olivacea, Ag. (olive Sphacelaria); filaments short erect 

 tufted sparingly branched, branches alternate simple. — Ag. Sp. 



