Himanthaha.) ALG* INARTICULATE. ^69 



" Cattle are exceedingly fond of this plant, and never fail to browze on 

 it in winter, as soon as the tide leaves it within their reach. At this 

 season it is peculiarly wholesome, as counteracting the costiveness in- 

 duced by their ordinary straw-commons." Carm. 



7. F. tuberculdtus, Huds. (tubercidated Fkcus); frond erect 

 cylindrical dichotomous destitute of midrib and vesicles, recep- 

 tacles terminal cylindrical. Turn. Syn. Fuc. p. 305, Hist. Fuc. 

 t. 7. Ag. Sp. Alg.v. \.p. 98. Grev. Alg. Brit. p. 18.— F. bifurca- 



tus With. 



Rocky coasts of Cornwall ; Ilfracombe; Bill of Portland and North 

 of Ireland. Summer and Autumn.!* .—Root somewhat creeping. Fronds 

 olivaceous when fresh ; when dry, hard, black and brittle. 



5. Himanthalia. Lyngb. Himanthalia. 



Frond coriaceous, orbicular, peziziform. Vesicles none. Re- 

 ceptacles (frond-like) elongated, strap-shaped, compressed, 

 dichotomously divided, springing from the centre of the frond, 

 containing immersed tubercles furnished with a pore. Grev. 

 Alg. Brit. p. 19. t. 3.— Name ; tfi*s, uvra, a strap, and **c, the 



sect. 



This is indeed a verv extraordinary production, if we are to look 

 upon the peziziform base alone, in conformity with the opinion of \\ ah- 

 lenbero- Bory and Greville, as the frond ; while the frond-like portion 

 is all destined to produce the fructification. At any rate, no genus can 

 be more distinct in the whole Order of Algae. 



1. H. Urea, Lyngb. (strap-shaped Himanthalia); frond sub- 

 pvriform at length collapsing plano-concave stalked, recepta- 

 cles repeatedly dichotomous linear slightly tapering at the 

 extremity. Grev. Alg. Brit. p. 20. t. S.—Fucus loreus, Linn.— 

 Turn. Syn. Fuc. p. 246, Hist. Fuc. t. 196. Ag. Sp. Alg. v. 1. 



p. 98. 



Rocky sea-shores, frequent. Winter and Spring. ©. {Grev.) V-. 

 rearm.).— Receptacles, as they are here considered, from 2 to 10 feet long. 

 The young fronds have a verv curious appearance, before the receptacles 

 appear. Thev are about an inch in length, densely clustered, obovate or 

 turbinate, at length pe/iza->haped, covering the rocks to a great extent, 

 especially in the north. I have seen some, 00 exposed rocks in the 

 Orknevs, swollen into a large, hollow, exactly splneneal, smooth, black 

 ball probably in consequence of the neat of the sun, ranrying and 



expanding the air within. Captain Cannichael, who could Dpi have 



been awareofthe riewa entertained upon this Hibjecl by Bory and 

 Dr Greville, baa in bia M88. denned the Genus, "fron* calya- 

 formia atipitata, receptacula longusima dichotoma e dweo enuttens; 

 • lU ,| farther adds, 4i I would not have ventured to give the abOl e defini- 

 tions ofthia genus, had 1 not found that the fronds, hitherto so called, 

 drop off annually from the very base, and thus become identified witn 

 the receptacles of the Pucua, as mere fructification, [he cup alone is 

 perennial. The receptaclea of the first year issue froaa its centre, but 



e\er\ part of the disk il equally capable ofproduCing them, and It \v:ll 

 be found, accordingly, that in old plant., they are always more or less 



i ntric. 1 



