296 ALGiE INARTICULATE. [Laurencta. 



compressed snbcartilaginous bi-tripinnatifid the branches alter- 

 nate, ultimate ones obtuse simple or lobed. Grev. Alg. Brit, 

 p. 108. t. 14. — Chondria pinnatifida, Alg. Sp.Alg.p. I. p. 337. — 

 Gelidium pinnatif., Lyngb. — Fucus pinnatif ., Huds. — Turn. Syn. 

 Fuc. p. 267, Hist. Fuc. t. 20. E. Bot. t. 1202.— £. Osmunda ; 

 frond flat generally undivided, ramuli short andmultifid. Turn. 

 I. d — Fucus Osmunda, Gmel. Stachh. — y. angusta ; frond 

 roundish, ramuli cylindrical thickened upwards set on all sides 



of the stem often clustered and simple. Turn. I. c 8. tenuis- 



sima ; frond flat, ramuli very thin and much branched, the 

 branches divaricated. Turn. 1. c. 



a. j8. y. Rocks in the sea, everywhere. — l. Devon and Cornwall, Mr. 

 Stackhouse, Mrs. Griffiths. © . Summer. — Besides the common modes 

 of fructification on this very variable plant, Mrs. Griffiths finds capsular 

 receptacles, and Miss Cutler, saucer-shaped receptacles, filled with 

 " numerous linear, simple, or divided bodies, vertically arranged, appar- 

 ently composed of very short filaments surrounding a longitudinal axis, 

 the whole terminated by a number of round pellucid lobes." The spe- 

 cies is from one to many inches in length. 



2. L. obtusa, Lamour. {blunt-pointed, Laurcncia) ; frond cy- 

 lindrical filiform repeatedly pinnated, branches generally oppo- 

 site, ramuli cylindrical short patent truncated. Lamour. Essai 

 p. 42 {and L. intricaia, L. cyanospermia, together with L. gela- 

 tinosa and lutea of the same author, according to Ag.). Grev. Alg. 

 Brit. p. 111. — Chondria obtusa, Ag. Sp. Alg. v. 1. p. 340. — 

 Fucus obtusus, Huds. — Turn. Syn. Fuc. p. 43. Hist. Fuc. t. 21. 

 E.Bot.t. 1201. 



Parasitic on the larger Alga on most of our coasts, but chiefly in the 

 south. 0. Summer. — 3 — 6 inches long. Colour a pale very fugitive 

 pink. 



** Hamuli much attenuated at the base. 



3. L. dasyphylla, Grev. {thick-leaved Laurencia) ; frond fili- 

 form cylindrical branched in an irregularly pinnated manner, 

 branches patent mostly simple, ramuli cylindrical scattered pro- 

 liferous, attenuated at the base. Grev. Alg. Brit. p. 112 



L. caispitosa et Gig ar Una dasyphylla, Lamour. — Chondria 

 dasyph., Ag. Sp. Alg. v. 1. p. 350. — Fucus dasyph., Woodw. in 

 Linn. Trans, v. 2. p. 239. t. 21. Turn. Syn. Fuc. p. 38, Hist. 

 Fuc. t. 22. E. Bot. t. 847. 



Rocks and stones, on the sea-shore in various parts of Great Britain. 



0. Summer. — Frond 3 — 6 inches in length, pale pinky-brown, generally 

 marked with transverse striae. 



4. L. tenuissima, Grev. {slender Laurencia) ; frond filiform 

 much branched in a pinnated manner, ultimate branchlets short 

 setaceous much attenuated at the base. — Grev. Alg. Brit. p. 113. 

 — Gigartina tenuiss., Lamour. — Chondria tenuiss.,Ag. Sp.Alg. v. 



1. p. 353. — Fucus tenuiss., Good, et Woodiv., in Linn. Trans. 

 v. 3. p. 215. t. 19. Turn. Syn. Fuc. p. 35, Hist. Fuc. t. 100. 

 E. Bot. t. 1882. 



