92 



LAMINAEIACEiE,— Laminaria. iv. 



3. Laminaria dermatodea^ De la Pyl. ; stipes rising from a brancMng root, terete 

 below compressed or flattened above, dilating into a cuneate-oblong simple frond 

 afterwards becoming cordate at base, and palmately cleft from the apex. /. Ag. 

 Sp. Alg. l,p. 131. Phyllitis dermatodea^ Kutz. Sp. Alg. p. 567. 



Hab. On rocks, at and below low-water mark. Newfoundland, De la Fylceie. 

 (v. s. in Herb. T.C.D.) 



Stipe 3-4 inches long, in the young plant compressed, in the full-grown altogether 

 flat, passing into the base of an oblong or lanceolate frond, which in the young 

 plant is entire, but which at last, becoming more dilated and with a more cordate 

 base, is cloven into several segments and assumes the habit of L, digitata. 



I have seen only young specimens of this species, and in them the apex is imperfect. 

 They were collected by Despreaux and communicated to me by M, Lenormand. 



4. Laminaria saccharina, Lamour. ; stem cylindrical, solid, short, expanding 

 into a cartilaginous or submembranaceous, lanceolate or oblong, undivided frond. 

 J. Ag. Sp. Alg. vol. I, p. 132. Kiitz. Sp. Alg. p. 574. Rarv. Phyc. Brit. t. 289- Fucus 

 saccharinus, L. E. Bot. t. 1376. Turn. Hist. t. 163. Lam. Lamourouxii ? Bory, 

 Diet. CI. Hist. JSfat. %p. 189- 



Hab. On rocks in the sea, from low-water mark to four or five fathoms. 

 Common on rocky shores, from Greenland to New York ; and cast up from 

 deeper water on the New Jersey coast. (Its southern limit not ascertained beyond 

 Long-branch, N. J.), (v. v.). 



Root of several branching fibres, forming a conical holdfast. Stem from a few 

 inches to a foot or more in length, from a quarter to half an inch in diameter, 

 terete, compressed at its upper end, and gradually dilating into the base of the 

 terminal, undivided lamina. Lamina very variable in its proportionate length and 

 breadth, sometimes linear-lanceolate, sometimes ovato-lanceolate, sometimes ellip- 

 tical, acute, or obtuse, or drawn out at the apex into a long caudate prolongation, 

 from one to six or ten feet in length, and from one to twelve inches in breadth, flat, 

 or very much curled at the margin, and at length over the whole surface ; sometimes 

 regularly transversely wrinkled through the middle of the lamina, sometimes irre- 

 gularly bullated. Substance in some varieties membranous, in others cartilaginous 

 or leathery, or even horny in some. Colour of the leaf when young a greenish 

 olive, browner as it grows old. 



Numerous varieties, which perhaps demand future study, occur on the American 

 coast. The Laminaria Lamourouxii of Bory, which has been sent me from Boston 

 Harbour by Prof Asa Gray, and of which I also possess an authentic specimen from 

 Newfoundland, looks almost like a species, with its thickish, broadly elliptical, 

 scarcely waved frond, and its slightly branching root ; but I am not sufficiently 



