IV. LAMINARIACE^.— LAmNARiA. 93 



acquainted with it to say whether it has claims to be regarded as anything more 

 than a form. Prof. J. Agardh refers it unhesitatingly to L. saccharina, and it must 

 be confessed, that if we separate it on the mere characters assigned it by M. Bory, 

 we must be prepared to admit to specific rank many other forms now referred to 

 L. saccharina. 



5. Laminaria longicrnris, De la Pyl. ; Stipes very long, slender at the base, hollow 

 and inflated in the middle, and gradually tapering to the apex ; frond undivided, 

 ovato-lanceolate, membranaceous, obtuse. J. Ag. Sp. Alg. vol. 1, p. 135. Kutz. 

 Sp. Alg. 2?. 576. ffarv. Phjc. Brit. t. 339. (Tab. VI.) 



Hab. In deep water, from five to ten fathoms (or more?). Very abundant on 

 the American shores, from Greenland to Cape Cod. Newfoundland, De la Pylceie. 

 Bahama Islands, Chauviti. (v. v.) 



Boot of many slender and much branched, clasping fibres, which issue at 

 irregular intervals from the lower part of the stipe. Stijie from eight to twelve 

 feet in length, very slender at the base, and there solid, gradually widening 

 upwards, and soon becoming hollow ; at length, towards the middle, widened to 

 upwards of an inch in diameter, and thence tapering to the apex, and terminating 

 in the broadly cuneate base of the lamina. Lamina, when full grown, 6 to 8 feet 

 in length, and from two to three feet in width, oblong-lanceolate or oval, very much 

 waved at the margins, and obtuse at the apex, of a thinner substance than in 

 L. saccharina. Colour of the stem yellowish brown, pale ; of the lamina a beauti- 

 ful pale greenish olive. 



This noble species, though having much general resemblance to the preceding, 

 is at once distinguished from every form of it by the very long, hollow stem, 

 tapering to both extremities. It is by far the most abundant species on the 

 northern coasts, and gi'adually diminishes, in the number of individuals, and in the 

 size and luxuriance of growth, as it extends southward. In Boston Bay it is still 

 plentiful, though of much smaller dimensions than at Halifax, where it is the chief 

 ornament of the sub-marine flora. I have seen no specimen from a more southern 

 locality that Cape Cod ; but M. Chauvin is said to have received it from the 

 Bahamas. In Europe it is scarcely known to grow beyond the limits of the Arctic 

 Sea, whence water-worn specimens occasionally reach the coasts of Scotland, and of 

 the north of Ireland. 



Plate VI. Fig. 1 . A young frond of Laminaria longicruris ; one third of the 

 natural size ; fig. 2. part of the hollow stipes of a full grown plant, the natural size. 



6. Lamnaeia trilaminata, Harv. MSS. — Olney, in proceedings of Providence 

 Franklin Society, vol. 1. p. 39- 



