vol.i] Setchell— Gardner. — Alga? of Northwestern America. 335 



Odonthalia floccosa f. macracantha (Kuetzing) Setchell and 



Gardner comb, no v. 



Lopkura macracantha Kuetzing, Tabula 3 Phycologicae, Vol. 

 15, p. 14. pi. 39. d-g, 1865. 



On rocks in the litoral zone. St. Paul Island, Alaska, Greeley 

 and Snodgrass, No. 5796! (cf. Setchell, 1899, p. 594, under 

 Rhodomela floccosa); west shore of Amaknak Island, Bay of 

 Unalaska, Alaska. W..4.,S'. and A.A.L., No. 3254!; Uyak Bay, 

 Kadiak Island. Alaska, W.A.8. and A.A.L., Nos. 5083!, 5085! ; 

 Harvester Island, Uyak Bay, Kadiak Island, Alaska, TT.^LS. 

 a,,d A.A.L., No. 5106! : Port Kenfrew, B. C, Butler and Polleyl 



This is a coarser and laxer form than the preceding and is 

 well represented by Knetziug's figures. The glornerules of repro- 

 ductive branchlets are distinct but not so dense as in f . comosa. 



Odonthalia Lyallii (Harvey) J. Agardh. Plate 27. 



On different alga?, in the upper snblitoral zone. Strait of Juan 

 de Fuea, B. C, Harvey (1862, p. 168, under Rhodomela Lyallii) ; 

 west coast of Whidbey Island. Wash., K.L.G., Nos. 3!, 126!, 

 161!, 193!, and in Collins. Holden and Setchell, P. B.-A., No. 

 940!; San Juan Island, Wash., Tilden, No. 319!, under 

 Laureneia Grevilleana. 



We have had considerable trouble in determining with any 

 certainty, or at least satisfaction, the Odonthalias of our coast, 

 and the present arrangement, while it seems to us to represent 

 the case fairly well from the species point of view, must neces- 

 sarily be provisional as far as the exact synonymy is concerned. 

 The plant included under this name, is, we feel cpiite certain, 

 the plant of Harvey. Besides the locality of Whidbey Island, 

 Gardner has found it also near Port Townsend. The latter locality 

 must be in the same immediate region whence the type specimen 

 was obtained. The species, as it comes ashore, is frequently long 

 (up to 45 cm. and probably even longer), without trace of mid- 

 rib, with the eystocarps alternating and distant on unchanged 

 pinnules, while the stichidia are placed more closely, but the 

 rhachis is not appreciably abbreviated. These are shown in the 

 figures on plate 27. The only species which seems to come near 

 it is the next, but in that, the frond has a distinct midrib and the 



