266 Lfnirersiti/ of California Publications . [botasy 



A considerable study of various forms of Agaruiii, both on 

 tlie eastern and western coasts of North America, has led us to 

 the conclusion that the five species or forms enumerated and 

 described \>y Postels and Ruprecht all belong to one and the same 

 species as indicated above. They all seem to possess a stipe which 

 is cylindrical or nearly so and scrolls at the l)ase of the blade, 

 two characters which distinguish them from the next species. 



Agarum fimbriatum Harvev. 



On stones or piles, from just below low water mark into water 

 of 10-16 fathoms depth. Esquimalt, B. C, Harvey (1862. p. 

 166); west coast of Whidbey Island, Wash., X.L.G., No. 84!; 

 Friday Harbor, San Juan Island, Wash., X.L.G., No. 678!; 

 Tracyton, Kitsap County, Wash., Tildni, No. 345! 



This species seems amply distinct from any other Agarum 

 that has ]:)een described. It has a very much flattened, rather 

 short stipe which becomes fimbriate with haptere-like out- 

 growths. The base of the blade has no scrolls as in the preced- 

 ing species and which we have considered a characteristic of the 

 genus. The margins are peculiarily crispate. It seems to l)e 

 common in Puget Sound, and has not ])een found elsewhere, 

 except three specimens which were found cast ashore at San 

 Pedro, California, by Mrs. H. I). .Tohnston. How it came to be 

 so far south of its hitherto only known district is one of those 

 puzzles of distribution which are extremely difficult to solve. 



Thalassiophyllum Clathrus (Gmelin) P. &. K. 



On rocks, forming a zone at low water mark. Agattu Island, 

 Alaska, Toimsend, No. 5762!; Kyska Island, Alaska, Toirnsend, 

 No. 5772! ; St. Paul Island, Alaska, Herb. I). ClJafonl (Setchell, 

 1899, p. 592); Amakuak Island, Bay of Unalaska. Alaska, 

 Posfels and Bi(precht (\8^0, p. 11), ]] .A.S. (i„d A.A.L., No. 

 3246!, and in Collins, Holden and Setchell, P. B.-A., No. 

 XXXVI!; Sitka, Alaska, Posfels and BuprecJif (ISiO, p. U). 



This large and striking plant seems to l)e characteristic of 

 Bering and Ochotsk Seas. The single locality of Sitka, as given 

 by Postels and Ruprecht, exists outside of these, but the locality 

 is doubtful, for Mertens (1829, p. 49) says that he did not see 

 this species until he came to the Bay of Unalaska. It is evidently 



