SUPPLEMENT. 
129 
interstices and a flat, entire margin ; apices rounded ; conceptacles clustered near the 
ends of the lacinise, on the surface of the lamina ; tetraspores forming deep-red sori in 
the dilated apices. • J. Ag. Sp. Alg. 2, p. 379- Sphcerococcus corallinus , Borg , Coq. 
p. 175, t. 16. Kiitz. 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 lacinise. The conceptacles are 
immersed in the ultimate segments of the lacinise, 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* Gigartina Chamissoi , (?) Mont. ; J. Ag. Sp. Alg. 2, p. 267. Sphcerococcus 
Chamissoi, Ag. Ic. Med. t. 6. Mart. lc. 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. Irid^a dichotoma, 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. I. micans , var. dichotoma. Hook. f. and Harv. FI. Ant. 2, p. 487. 
I. dichotoma , Harv. in Hook. Journ. 1845, 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 
