70 FUCACE^.— Fucus. ir. 



4. Yucvs/urcatus, Ag. ; stipes compressed, expanding into a linear, dichotomous, 

 ribbed frond ; the margin very entire ; air-vessels none ; receptacles elongate, 

 linear, flattish, repeatedly forked. J. Ag. Sp. Alg. vol. 1, p. 209- Ag. Ic. Ined. t. 

 14. Kiitz. Sp. Alg. p. 591. 



Hab. Newfoundland, De la Pylaie. 



Frond a foot or more in length, and nearly four lines wide, with a less evident 

 midrib than allied species, and which is altogether obsolete below the receptacle, 

 dichotomous and fastigiate. Vesicles none. Receptacles three inches long, scarcely 

 thicker than the frond and nearly flat, linear, tapering towards the apices, obtuse, 

 rarely simple, generally once or twice forked. J. Ag. I. c. 



I am unacquainted with this species. 



5. Fucus ceranoides, Linn. ; frond plane, coriaceo-membranaceous, linear, dicho- 

 tomous, midribbed, without vesicles ; the margin very entire ; lateral branches 

 narrower than the principal divisions, repeatedly forked, level-topped, bearing fruit 

 at their apices ; receptacles spindle-shaped or bifid, acute. J. Ag. Sp. Alg. vol. 1, 

 jy. 209. Kiitz- Sp. Alg. p. 591. Turn. Hist. t. 89. E. Bat. t. 2115. Harv. Phyc. 

 Brit. ^.271. 



Hab. On rocks and stones between tide-marks, chiefly where fresh water mixes 

 with the sea. Rare on the American coast. New York, /. Agardh. (v. v.) 



Fro7id resembling F. vesiculosus in aspect, but of thinner and more transparent 

 substance, destitute of air-vessels, though portions of the frond occasionally puff 

 out into irregular distensions ; and having numerous lateral, many-forked, narrow 

 segments, whose tips are at length transformed into fruit. Receptacles commonly in 

 pairs, sometimes confluent, bright yellow, or greenish, pointed. 



I have not seen any American specimen of this species, which has been sent to 

 Professor Agardh from New York. 



6. Fucus Earveyanus, Dne. ined. [cum Icone eximia). 



Hab. Monterey, California, Eerh. Paris, (v. s. in Herb. T.C.D.) 



I forbear to describe this species, named and figured by my friend M. Decaisne, 

 some years ago, but of which no specific character has, I believe, yet appeared. It 

 is very closely related to F. ceranoides, and I am not certain by what characters it 

 is proposed to be distinguished from that species. 



