Ser. MelanospermejE. Fam. Dictyotea. 



Plate XXV. 



STRIARIA ATTENUATA, Grev. 



Gen. Char. Hoot a small, naked disc. Frond tubular, membranaceous, 

 continuous, branched. Fructification) groups of naked, roundish 

 spores, disposed in transverse lines. Stbiaria — from the spores 

 being arranged in transverse stria or lines. 



Striaria attenuate/, ; branches and ramuli mostly opposite, tapering to each 

 extremity. 



Striaria attenuata, Grev. Crypt. Fl. (Syn.) p. 44. Alg. Brit. p. 55. t.9. Hook. 

 Br. Fl. vol. ii. p. 279. Harv. in Mack. Fl. Rib. part 3. p. 176. TVyatt, 

 Alg. Damn. no. 160. Meneg. Alg. Ital. et Balm. p. 157. /. Ag. Alg. Medit. 

 p. 41. Endl. 3rd Suppl. p. 26. Kiitz. Phyc. Gen. p. 336. t. 2] . f. 2. Harv. 

 in Hook. Journ. Bot. vol. i. p. 298. McCalla, Alg. Hid. no. 18. 



Scytosiphon olivascens, Carm. MSS. 



Carmichaelia attenuata, Grev. Sc. Crypt, t. 288. 



Zonaria Naccariana, Ag. MSS. Nac. Fl. Ven. vol. vi. p. 94. Alg. Adr. p. 82. 



Zonaria lineolata, Ag. in Liar. Batisb. 1827. Ag. Alg. Fur. t. 40. 



Stilophora crinita, Ag. Aufzd/d, p. 17. Nac. Fl. Ven. vol. vi. p. 94. Alg. 

 Adr. p. 83. 



Solenia crinita, Ag. Syst. p. 186. 



Solenia attenuata, Ag. Syst. p. 187. 



Ulva attenuata, Nac. Fl. Ven. vol. vi. p. 72. Alg. Adr. p. 54. 



Dictyota lineolata, Grev. Syn. pi. xliii. 



Conferva crinita, Ruch.Fl. Ven. p. 269. 



Hab. Parasitical on the smaller Algae, generally growing beyond the tide 

 range. Annual. Summer. Appin, Copt. Carmichael. Bute, /Jr. 

 Greville. Belfast Lough, Br. Lrtmmond. Strangford Lough, .)//•. 

 TV. Thompson. Torbay, Mrs. Griffiths; Miss Cutler. Koundstone 

 Bay, Mr. MJCalla. Devonport, Mr. Eal/s; Rev. IV. S. Ilore. Pen- 

 zance and Ilfracombe, Mr. Ralfs. 



Geogr. Distr. Shores of British Islands. Coast of Sweden, Areschoug ! 

 Mediterranean Sea. 



Desc. Root a small, scutate disc. Fronds tufted, 3-12 inches long, or more, 

 from half a line to one or two lines in diameter, tubular, tapering to each 

 extremity, famished at short intervals with branches similar in form, hut of 

 rather less diameter than the main frond, which arc again beset with smaller 

 ramuli. Branches and ramidi mostly opposite, BOmetimes in threes, raivh 

 scattered, patent, all much constricted at their insertion, and produced ;it 

 their apices into very fine, setaceous points. When in fructification, the 

 branches, in all parts of the frond, arc marked, at spaces of half a line 

 asunder, with transverse rings or bands composed of clusters of roundish 



