SUPPLEMENT. 123 



Hab. On rocky sea-shores. Newbury port, Mass. Captain Pike, 1852. (v. v.) 



Fronds, two feet long or more, from one half-inch to one or two inches in width, 

 dichotomous, with a thick midrib, bordered by a sharply serrated lamina. Air-vessels 

 none. Receptacles flat, formed in the acuminated extremities of the branches, sharply 

 serrate like the other parts of the frond. 



I have received a small fragment of this common European plant, stated to have 

 been found in the above locality on the American coast. It is hardly probable that it 

 is either confined to one locality, or even rare, wherever it occurs ; yet none of my 

 other American correspondents have sent it ; nor do I know the circumstances under 

 which Captain Pike obtained it. I hope this notice may lead some one on the coast to 

 investigate the subject ; for European botanists are yet uncertain whether F. serratus 

 be really a bona fide native of the American coast, or merely a stray waif, accidentally 

 cast ashore. 



Page 106, add, 



2. ZoNARLi/ava, Ag. ; frond erect, with an elongated, branched, woolly stipes, the 

 branches expanding into cuneate, flabelliform, vertically cleft and laterally laciniated, 

 naked laminae ; segments wedge-shaped, with radiating, longitudinal striae ; sori 

 roundish, scattered. J. Ag. Sp. Alg. \, p. 110. Stypopodium flavum, Kutz. Sp. Alg. 

 p. 563. 



Hab. Pacific Coast, Dr. Schott. (v. s.) 



A small specimen, apparently referable to this species, was collected by Dr. Schott 

 on the Pacific coast, but the locality is not stated. It is about two inches high, much 

 narrower and more branched than Z. lobata, with stupose, linear, riblike patches 

 extending up the principal lobes. Perhaps, therefore, it is rather referable to Z. stuposa, 

 J. Ag., if that be a distinct species from Z.flava. 



Page 113, add, 



VI.* STEIARIA, Greo. 



Root a small, naked disc. Frond tubular, membranaceous, continuous, branched. 

 Fructification, groups of naked, roundish spores, disposed in transverse lines. 



1. Steiaeia attenuata, Grev. ; branches and ramuli mostly opposite, tapering to each 

 extremity. Grev. Crypt. Fl. Syn. p. 44, tab. 288. Alg. Brit. p. 55. t. 9. Wyatt, 

 Alg. Danm. No. 160. J. Ag. Sp. Alg. 1. p. 80. Harv. Phyc. Brit. t. 25. Kiitz. 

 Sp. Alg. p. 553. Phyc. Gen. t. 21. f. 11. 



Hab. Flushing, New York Bay, Professor Bailey. 



