SUPPLEMENT. 129 



interstices and a flat, entire margin ; apices rounded ; conceptacles clustered near the 

 ends of the laciniae, on the surface of the lamina ; tetraspores forming deep-red sori in 

 the dilated apices. J. Ag. Sp. Alg. 2, p. 379. Sphcerococeus corallinus, Borg, Coq. 

 p. 175, t. 16. Kutz. Sp. Alg. p. 780. 



Hab. San Diego, California, Mr. A. D. Frye. (v. s. in Herb. T.C.D.) 



A single Californian specimen only has yet been seen, and I doubtfully refer it to 

 R. corallina, in preference to founding a new species on such imperfect data. The frond 

 is stipitate ; the stipes filiform, 2-3 inches long, then widening and passing into the 

 cuneate base of a flabelliform, dichotomously parted lamina, with broadly linear or 

 somewhat cuneate segments. The lower part of the stipes throws out 2 or 3 proliferous 

 frondlets, and similar ones spring from the margin of the lacinias. The conceptacles are 

 immersed in the ultimate segments of the laciniae, which then are truncated and foliiferous. 

 The colour is a deep-red, and the substance rigid and membranaceous. Such is the 

 Californian specimen, and it tolerably agrees with the Chilian species, whose character 

 is given in the above diagnosis. 



Page 175, add, 



2* GiGAETiNA Chamissoi, (?) Mont. ; J. Ag. Sp. Alg. 2, p. 267. Sphoerococcus 

 Chamissoi, Ag. Ic. Med. t. 6. Mart. 2c. Sel. Bras. t. 3, jig. 1. 



Hab. West Coast, Dr. Schott. 



A fragment of a Gigartina, closely allied to G. Chamissoi, if not a mere form of it, 

 occurs in Dr. Schott's new Mexican collection. It is too imperfect for description. 

 G. Chamissoi is a common species on the coast of Peru, and may very probably extend 

 to the north of the Equator. 



Page 180, add, 



6. Iridjea dichoto ma, Harv.; stipes linear, compressed, simple or branched, passing 

 into the cuneate base of the broadly cuneiform or obovate, repeatedly forked lamina ; 

 lacinise shallow and rounded, divaricating, their margin entire or denticulate ; surface 

 smooth and glossy. /. micans, var. dichotoma. Hook.f. and Harv. Fl. Ant. 2, p. 487. 

 /. dichotoma, Harv. in Hook. Journ. 1 845, p. 262. 



Hab. California, Mr. A. D. Frye. (v. s.) 



Stipes 1-2 inches long, about a line wide, throwing out 2-4 minutely stipitate fronds, 

 which are 4-6 inches long, and 3-4 wide, at their greatest width. The base of the 

 frond is cuneate, and the lobes into which it divides are also broadly cuneiform. They 

 divaricate from each other, leaving very wide sinuses between. The frond is thus 

 sometimes thrice forked, the last furcation being minute, and frequently a mere inden- 

 tation. The substance is rather thin and membranous. The surface is smooth and 

 glossy, and the colour a fine purple-red. 



s 



