Ser. MELANOSFERMEiE. ( 45 ) Fam. LAMINARI^E. 



Plate CXLVII. 

 LAMINAEIA DIGIT AT A.—Lamour. 



v<^ 



Gen, Char. — Frond stalked, coriaceous or rarely membranaceous, flat, without a midrib. 

 Fructification : spores collected in spots or sori under the surface of some part of 

 the frond. Name from ^awiMta, " a thin plate." 



Laminaria digitata. — Stem elongated, -woody when old, cylindrical at 

 the base, slightly tapering upwards, suddenly expanding into an oblong flat 

 frond, generally deeply torn into narrow linear or lanceolate segments. 



Laminaria digitata. — Lamour. Ess. p. 22; Lyngh. Hyd. Dan. p. 20; Ag. Sp. Alg. 

 vol. i. p. 112 ; Ag. Syst. p. 270 ; Grev. Alg. Brit. p. 27 ; Hook. 

 Br. Fl. vol. ii. p. 271 ; Wyatt, Alg. Damn. No. 156 ; Endl. 3rd Suppl. 

 p. 27 ; Post. & Rupr. t. 12 ; /. G. Agardh, Sp. Gen. Alg. vol. i. 

 p. 134 ; Harv. in Mack. Fl. Hih. part 3, p. 171 ; Harv. P. B. 

 plate 223; Harv. Man. p. 29; Harv. Syn. p. 26; Atlas, plate 6, 

 fig. 24; Harv. N. B. A. part 1, p. 94. 



Laminakia stenoloba. — De Lap. Terr. Neim. p. 55. 



Hafgygia digitata.— Kiltz. Pliyc. Gen. p. 346, t. 30 and 31. 



FucTJS digit atus. — Linn. Mant. p. 134 ; Fl. Dan. t. 392 ; Stack. Ner. Brit. p. 5, 

 t. 3 ; Esper, Ic. Fue. p. 99, t. 48, 49 ; Huds. Fl. Angl. p. 579 ; 

 Lightf. Fl. Scot. p. 935 ; With. Br. PL vol. iv. p. 98 ; Linn. Trans. 

 vol. iii. p. 152 ; Twm. Syn. p. 207 ; Turn. Hist. t. 162 ; E. Bat. 

 t. 2274. 



Frous hyperboreus. — Gunn. Fl. Now. vol. i. p. 34, t. 3. 



Hab. — On rocks and stones in the sea, from one to twenty fathoms. Perennial. Very 

 common. 



Geogr. Dist. — Northern Atlantic ; Icy Sea ; Kamtschatka. 



Description. — Root consisting of numerous strong branching fibres, 

 strongly adhering to the rocks by means of their flattened discs, and 

 forming a conical or hemispherical mass, four to six inches in diameter. 

 Stem two to four feet in leng-th or more, one to one and a-half inch in 

 diameter at the base, cylindrical, slightly tapering upwards, veiy rough 

 and corrugated on the surface, solid and woody, suddenly expanding at 

 the summit into a broad flat frond, two to four feet, or sometimes more, 

 in length, and from six inches to a foot or more in breadth ; quite 

 entire when young, but at length split up into numerous narrow lacinise, 

 more or less torn or erose at the apices. Substance coriaceous, wood}'- 

 when old, closely adhering to paper by means of a tenacious substance 

 which soon covers the surface when removed from the water. Colour, a 



