M 



vol.i] Setcli el 7- Gardner. — Algce of Northwestern America. 303 



Gigartina radula f. microphylla (Harvey) Setchell. 



Floating. West shore of Whidbey Island, Wash., N.L.G., 

 No. 64! 



This plant seems to correspond to Harvey's G. microphylla, 

 which one of us (ef. Setchell, in Collins, Holden and Setchell, 

 P. B.-A., No. XIX, 1899), has already reduced to a form of G. 

 radula . 



Gigartina radula f. exasperata (Harvey and Bailey) Setchell. 



On rocks, lower litoral and upper sublitoral zones. West 

 coast of Whidbey Island, Wash., X.L.G., Nos. 103! , 104! , 105! , 

 170! . 172! . 173! . 174! , 282! ; Channel Rocks, near Port Orchard, 

 Kitsap County. Wash., Tilden, No. 327!, under G. spinosa; 

 Tracyton. Kitsap County, Wash., Tilden, No. 218! ; opposite 

 Fort Nisqnally. Pierce County, Wash., Harvey and Bailey (1851, 

 p. 371. under G. exasperata) , Bailey and Harvey (1862, p. 162, 

 under G. exasperata). 



The Gigartina exasperata Harvey and Bailey (1851, p. 162, 

 pi. 5) was founded on the young tetrasporic plant which is more 

 thin and more ample than the adult. The adult cyst ocarpic plant 

 of this species is decidedly thick and takes on the form described by 

 Kuetzing as Mastocarpus corymoiferus (1867, pi. 46) and is well 

 represented by the specimen (in our copy) under No. 327 of 

 Tilden "s American Alga 1 . The morphology and histology have 

 been described by Olsen (1899) and by Humphrey (1901). 

 Turner's figure (1808, pi. 25) of Fucus bracteatus, credited to 

 the coast of Northwestern America, represents a plant inter- 

 mediate between the type and this form. The young plant of 

 this form is often a very large plant, a meter or two long and *N 

 broad in proportion. As it matures it seems to become smaller 

 and thicker. These observations were made principally on the 

 coast of California, where this form is found in abundance. 



Erythrophyllum delesserioides J. Agardh. 



On rocks in the upper sublitoral zone. Vancouver Island, 

 B. C, Wood in Herb. J. E. Gray (fideJ. G. Agardh, 1870, p. 11) ; 

 Port Pienfrew, B. G, Tilden, No. 505!, Butler and Policy, No. 2. 



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