266 University of California Publications. [botahv 



A considerable study of various forms of Agarum, both on 

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

 the conclusion that the five species or forms enumerated and 

 described by 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 base of the blade, 

 two characters which distinguish them from the next species. 



Agarum fimbriatum Harvey. 



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., N.L.G., No. 84!; 

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

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



This species seems amply distinct from any other Agarum 

 that has been 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 peculiarity crispate. It seems to be 

 common in Puget Sound, and has not been found elsewhere, 

 except three specimens which were found cast ashore at San 

 Pedro, California, by Mrs. H. I). Johnston. 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. &. R. 



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

 Alaska, Townsend, No. D762!; Kyska Island, Alaska, Townsend, 

 No. r.772! ; St. Paul Island, Alaska, Herb. D. C.Eatoni (Setchell, 

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

 Postels mill Ruprecht (1840, p. 11), U .A.> S. and A.A.L., No. 

 :{24(i!, and in Collins, Holden and Setchell, P. B.A., No. 

 XXXVI! ; Sitka. Alaska, Postels ami Ruprecht (1840, p. 11). 



This large and striking plant seems to be 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 



