SUPPLEMENT. 
125 
with short, spine-like, opposite, or rarely alternate ramuli ; articulations as long as 
broad ; silicules very long, linear-lanceolate, attenuate, densely striate transversely, 
terminating the principal branches and ramuli. Harv. Phyc. Brit. t. 258. 
Hab. Penobscot Bay, Mr. Hooper, (v. s.) 
I have seen an American specimen collected by Mr. Hooper, which I venture to 
associate with the Orkney plant to which the above character is given in Phyc. Brit. 
Perhaps it is a mere form of E. littoralis; though a remarkable one. 
Page 140, add, 
3* Ectocarpus amphibius , Harv. ; tufts short, loose, soft, pale olive ; filaments very 
slender, sub-dichotomous ; ultimate branches alternate, spreading ; articulations two or 
three times longer than broad ; silicules linear-attenuate, spine-like, mostly sessile, 
scattered. Harv. Phyc. Brit. t. 183. 
Hab. In fresh (probably brackish ?) water, near New York, Mr. Hooper, (v. s.) 
Tufts 2-3 inches long, very flaccid and slender ; pale brown when fresh, fading to a 
dull greenish-olive in drying. This is nearly related to E. siliculosus , and may perhaps 
be regarded as a depauperated variety of that common species, altered by having grown 
in a less saline medium than usual. In England it occurs in brackish ditches near the 
coast. The American locality is not particularly specified. 
Part II. — RHODOSPERMEiE. 
Page 23, add, 
7. Chondria nidijica ; frond ultrasetaceous, filiform, sparingly and distantly branch- 
ed ; branches alternate or secund, quite simple or forked, long, cordlike, naked, 
or emitting at intervals fascicles of forked or multifid fructiferous ramuli ; tetraspores 
several, near the tips of the ramuli. (Tab. L. B.) 
Hab. Pacific Coast, Dr. Schott. ( v. s. in Herb. T. C. D. ) 
Fronds 6-8 inches long, as thick as sparrow’s quills, cylindrical, inarticulate, sparingly 
branched in a manner between alternate and dichotomous ; the branches, by frequent 
non-development of one of the arms of the fork, appearing unilateral. Branches several 
inches long, quite simple, or once or twice forked ; or bearing a few secondary branches 
one or more inches long, either quite naked or furnished at intervals of about an inch 
with tufts of short, fructiferous ramuli. These latter are about quarter-inch long, 
as thick as hog’s bristle, densely tufted, and simple or sub-divided. In the specimen 
examined some of them bear tetraspores. A transverse slice of the inarticulate frond 
