THE MARINE ALQtM OF NEW ENGLAND. 93 



larly of its basal portion ; the presence or absence of a series of alternate depressions 

 and elevations -within the margin ; and the position of the frnit. The growing portion 

 of the Laminarice is at the base of the lamina, and the apex of the stipe and the old 

 fronds are pushed off by the newly formed ones below. The fruit is perfected in autumn 

 and winter. 



L. LONOriCRURiS, De la Pyl. {L. longicruris, Ann. Sei., 1. c, PI. 9 a 

 and &; Phyc. Brit., p. 339; E'er. Am. Bor., Yol. I, PI. 6.) 



Exs. — Algae Am. Bor., Farlow, Anderson & Eaton, No. 117. 



Fronds solitary or gregarious, attached by numerous long, slender, 

 branching fibers ; stipe six to twelve feet long, one to two inches thick, 

 slender and solid at the base, becoming hollow and inflated at the middle 

 and upper part, contracted at the apex; lamina ovate-lanceolate, five to 

 twenty feet long, two to three feet broad ; margin very wavy, within the 

 margin two rows of depressed spots ; fruit forming a continuous band 

 in the center of the frond; color lightish brown; substance rather 

 delicate. 



Common in deep water, and at Eastport at low- water mark. 



From Nahant, Mass., northward ; North Atlantic and Arctic Oceans. 



A striking species, easily recognized when in typical condition, but unfortunately 

 variable, though not so much so as our other species. The root-fibers are long, rather 

 slender, and much branched. The stipe is slender at the base, but expands gradually 

 upwards until it is at times two inches in diameter. The greatest diameter is about 

 two-thirds of the way up the stipe, which is then contracted, sometimes quite suddenly. 

 "When young and only a few inches long, the center of the stipe is filled with a solid 

 mass of delicate filaments, but it soon becomes hollow. When torn from their attach- 

 ments by storms, large specimens, in consequence of the hollow stipes, float in a pecu- 

 liar way, the upper part of the stipe projecting above the water like an elbow and the 

 lamina dipping below the surface. The lamina is, in comparison with the stipe, 

 shorter and broader than in our other species. This is especially the case in young 

 specimens, where the stipe may be several times longer than the lamina. In mature 

 plants, however, the comparative length of the lamina varies very much with the 

 place of growth. The present species has never been certainly known to occur south 

 of Cape Cod. Specimens resembling L. saccharina, but with hollow stipes, have been 

 collected in Long Island Sound. Whether really belonging to L. longicruris is doubt- 

 ful, and the subject requires farther investigation. 



L. saccharina, (Linn.) Lam.xJ 



Frond attached by numerous branching fibers ; stipe solid throughout, 

 terete, somewhat swollen in the middle, three inches to four feet long ; 

 lamina elongated, lanceolate, fusiform or cuneate at base, three to thirty 

 feet long, six to eighteen inches wide ; margin wavy, a row of depressions 

 on each side of lamina ; fruit forming a central band. 



Yar. phtllitis, Le Jol. (L. pJiyllitis, Phyc. Brit., PI. 192.) 



Fronds small, lamina thin, margin slightly wavy, base of lamina fusi- 

 form. 



