V. CERAMIACEiE. 233 



Hab. Golden Gate, California, Capt. N. Pike. (v. s. in Herb. T. C. D.) 



Frond two to three inches high, as thick as hog's bristle below, tapering to a 

 capillary diameter above. Stem percurrent, slightly flexuous, set with alternate, 

 distichous, sub-horizontal branches, the lowest of which are longest. General out- 

 line of the frond ovate. Brandies flexuous, naked in the lower half or with a few 

 squarrose ramuli, alternately branched beyond the middle ; the secondary branches 

 of very unequal lengths, ziz-zag, simple or variously decompound, sometimes 

 resolved into an intricate, thorny, bushy head. Ramuli all very patent, alternate, 

 variously compound, some quite simple, some bifid or trifid, and some pinnulate, 

 the pinnelli divaricating. Stem veiny below, but not opaque. Articulations of 

 nearly uniform length in all parts of the frond, except toward the base of the stem. 

 Cell walls remarkably thick. No fruit seen. 



Of this apparently distinct species I liave seen but a single specimen, and 

 probably the specific character and description may require to be revised and 

 corrected. Had the specimen come from the Atlantic Coast I should hardly have 

 ventured to propose a species on such imperfect materials. 



5. Callithamnion Borreri, Ag.; fronds densely tufted, capillary, pellucidly 

 articulate to the base, pinnately or flabellately branched ; branches beset in their 

 lower part with spirally inserted, mostly simple, elongate ramuli, distichously plu- 

 mulate above ; plumules fan-shaped, bare of ramuli in the lower half, simply 

 pinnate beyond the middle ; the pinnte patent or incurved, not much tapered, 

 obtuse ; articulations of the branches two to six times, of the pinnaj twice or thrice 

 as long as broad ; tetraspores numerous on the inner face of the pinnte. J. Ag. 

 Sp. Alg. 2, p. 49. Harv. Phyc. Brit. t. 159. Klitz. Sp. Alg. -p. 643. Conferva 

 Borreri, E. Bot. t. 1741. 



Hab. New Bedford, Dr. Roche. Newport and Newhaven, Dr. DurJcee. Sea- 

 counot, 3fr. Congdon. New York, Messrs. Walters^ Hooper^ Calverley., Sfc. (v. v.) 



Tufts one to three inches high, dense, sub-fastigiate. Filaments decompound 

 from the base, the lower branches spreading to all sides, often of nearly equal 

 length ; the lesser branches irregularly inserted, either naked in their lower half, or 

 beset with long, simple, hair-like ramuli, distichously plumulate beyond the middle. 

 The plumules are petiolate, or naked below, pinnate above. Pinnai spreading, 

 obtuse. Articulations throughout the plant (except rarely near the base of the 

 stem) destitute of veins ; those of the stem very variable in length in different 

 specunens, sometimes only twice or thrice, sometimes four to six times as long as 

 broad ; those of the ramuli more uniform, and mostly contracted at the nodes. 

 Tetraspores on the inner face of the ramuli, sometimes few, sometimes many. 



More slender and softer than the common European form ; and had my attention 

 been confined to Mr. Congdon's specimens I should possibly have described them as a 



VOL. IV. — ART 5. H H 



