Ser. RHODOSPERME. Fam. Chondrice. 
Puate LV. 
LAURENCIA PINNATIFIDA, Zamouw. 
Gen. Cuar. Frond cylindrical, or compressed, linear, pinnatedly branched, 
the apices obtuse; structure cellular, solid. Lructification of two 
kinds, on distinct individuals ; 1, ovate capsules (ceramidia) furnished 
with a terminal pore, containing a tuft of pear-shaped spores; 2, tri- 
parted tetraspores imbedded in the ramuli. Lavurencia (Lamour.),— 
in honour of MW. de la Laurencie, a French naturalist. 
Lavrencta pinnatifida ; frond compressed or subcylindrical, cartilaginous, 
bi-tripmnatifid, the divisions alternate; the ultimate ones linear, 
erecto-patent, simple or lobed. 
LAURENCIA pinnatifida, Lamour. Ess. p. 42. Grev. Alg. Brit. p. 108. t. xiv. 
Hook. Br. Fl. vol. ii. p. 296. Harv. in Mack. Fl. Hib. part 3. p.198. Wyatt, 
Alg. Danm. 0.113. Harv. Man. p.69. Mont. Pl. Canar. p. 154. Hook. 
fil. et Harv. Alg. Nov. Zeal. no. 65. Hook. fil. Fl. Ant. part.i. p. 184. 
J. Ag. Alg. Medit. p.114. Mont. Voy. Pole Sud. Bot. p.126. Endl. 3rd 
Suppl. p. 43. 
CHonpRIa pinnatifida, 49. Sp. Aly. vol. i. p. 337. Syst. p. 201. Hook. Fl. 
- Scot. part. 2. p.105. Grev. Fl. Edin. p.291. Kiitz. Phyc. Gen. p. 437. 
GELIDIUM pinnatifidum, Lyngb. Dan. p. 40. t. 9. 
Fucus pinnatifidus, Gi. Linn. Syst. Nat. p.1385. Huds. Fl. Ang. p. 581. 
Lightf. Fl. Scot. p. 953. Stack. Ner. Brit. p. 48. t. 11. Turn. Syn. 
vol. 2. p.267. HMist.t.20. £. Bot. t. 1202. 
Fucus multifidus, Huds. Fl. Ang. p. 581. 
Var. 8, Osmunda; frond flat, generally undivided; ramuli short, and 
multifid. 
Fucvs pinnatifidus, 8. Osmunda, Turn. Syst. l.c. Hist. t. 20. 
F Fucus Osmunda, Gm. Linn. Syst. p. 1385. Gm. Hist. Fue. p. 155. t. 16. 
f.2. Stack. Ner. Brit. p. 46. t. 11. 
4 Fucus filicinus, Lightf. Fl. Scot. p. 954. (Exel. Syn. Huds.). 
Var. y, angusta; frond roundish; ramuli cylindrical, elongated, very erect, 
slightly thickened upwards. 
Fucus pinnatifidus, y, angustus. TZwrn. l.c. 
Var. 8, ¢enwissima ; frond flat, of small size ; ramuli very slender and much 
branched, the branches divaricated. 
Fucus pinnatifidus, 6, tenuissimus, Turn. 1. c. 
 *Var. ¢, Zittoralis; dwarf, greenish olive; frond flat, broad, tapering to the 
; base; ramuli short, emarginate, bearing cup-like bodies filled with 
; “ antheridia.” (?) 
i Has. On submarine rocks from the extreme of high water mark, to beyond 
the limit of low water. Abundant on the British coasts. 
Grocer. Distr. On the shores of the Atlantic, Pacific, Indian and Southern 
Oceans, abundantly. Mediterranean Sea. Red Sea. 
Descr. Root a disc, accompanied by fibres. Fronds tufted, 1-12 inches high 
or more, from half a line to two or three lines in width, flattish, compressed 
or subcylindrical ; the main stem undivided, or parted iuto two or three 
Pp 
