Vol.]] 8etcheU-(j<irdner. — AJ(j<v of NorfJiivesfern America. 299 



Iridaea laminarioides t. cordata (Tuiiri) Setciiell and Gard- 

 ner comb. nov. 



On rocks, up]»er and middle litoral zones. Shnmagin 

 Islands, Yakutat Ba}-, and Sitka, Alaska, Saunders (1901, p. 

 434, nnder I. memhranoreal ; Banks Island, B. C, Menzies (cf. 

 Tnrner, 1809, p. 118, pi. IIG, nnder Fncus corihdus); Victoria, 

 B. C, Tilden, Nos. 3281)! (cystocarpic, nnder /. laminarioides) , 

 328c!, (tetrasporic, nnder 1. himiuarioides) ; Esqnimalt, B. C, 

 Harveij (1862, nnder /. cordaia) : west coast of Whidbey Island, 

 Wash., N.L.G., Nos. 43b! , 102! , 180! ; Channel Rocks, near Port 

 Orchard, Kitsap County, Wash., Tilden, No. 329!, nnder /. 

 heffr(>r((rpa. 



We have arranged the plants mentioned above nnder this form 

 only after an extended study of the Irida'as of the western coast 

 of North America in the i)laces where they are to be found grow- 

 ing in abundance. The f . cordata is to be distinguished by its 

 short, broad, cordate, thick, and cartilaginous frond which may 

 be entire or may be much lobed, either in a regular or an irreg- 

 ular way, and by the large (2-3 nun. broad) prominent and irreg- 

 ularly lobed cystocarps. It seems to us that the following species 

 of the North Pacific Ocean may probably be placed here also, viz. : 

 /. heferorarpa P. & R. (1840, p. 18) and /. lilacina P. & R. (loc. 

 cit., p. 17). Saunders's plants are referred here because of his 

 statement that they are the same as No. 329, Tilden. They do 

 not seem to be the same as I. memlrranacea J. Agardh, at least as 

 figured ))y him (1879, pi. 10, f . 1-5) . That is apparently a thin- 

 ner and softer plant and of decidedly dift'erent habit. 



Iridaea laminarioides f. parvula Kjellman. 



On rocks, on exposed shores, upper and middle litoral zones. St. 

 Paul Island, Alaska, Greeley and Snodgrass, No. 5799! (Setchell, 

 1899, p. 593) ; west shore of Amaknak Island, Bay of Unalaska, 

 Alaska, W.A.S. and A.A.L., Nos. 3253!, 4042!; "Pinnacles," 

 Bay of Unalaska, Alaska, Tr..4.N. ((nd A.A.L., No. 500G!, and 

 in Collins, Holden and Setchell, P. B.-A., No. 931!; Karluk, 

 Kadiak Island, Alaska, ir.A.N., No. 50GG!; Harvester Island, 

 Uyak Bay, Kadiak Island, Alaska, W.A.S. and A.A.L., No. 

 5120! 



