vol.i] Setchell— Gardner. — Algie of Northwestern America. 347 



Microcladia Californica Farlow. 



Port Renfrew, B. C, Butler and Polley, No. 35. 



The determination is by Mr. F. S. Collins and the specimen is 

 preserved in his herbarium. 



Microcladia Coulteri Harvey. 



On alga? in the upper sublitoral zone. Esquimalt, B. C, 

 Harvey (1862, p. 175); Port Renfrew, B. C, Butler and Polley, 

 Xo. 37: Strait of Juan de Fuca, G. W. Lichtenthaler; west coast 

 of Whidbey Island, Wash., N.L.G., Nos. 26!, 37!, 99! 



The plants from Whidbey Island have good involucrate cysto- 

 carps and consequently belong here. Miss Tilden has distributed 

 a specimen (Xo. 206!) from Tracyton, Kitsap County, Wash., 

 which probably belongs here, but the specimen is fragmentary 

 and sterile and may belong to the preceding species. 



Rhodochorton Rothii (Turton) Xaegeli. 



On rocks in the litoral zone. St. Michael, Alaska, W.A.S., 

 Nos. 5244x1. 5153x!: Prince William Sound, Alaska, Saunders 

 (1901. p. 440); Victoria, B. C, N.L.G., No. 330! ; Hog Island, 

 near LaConner, Skagit County, Wash., N.L.G., No. 307! 



Some of the specimens bear tetrasporangia, notably No. 

 5244x. 



Rhodochorton subimmersum Setchell and Gardner sp. uov. 

 Plate 17. 



Prostrate filaments immersed in the cortex of the host plant, 

 giving rise to simple erect filaments which project above the 

 surface of the host, and bear the tetrasporangia at the tips. 

 Tetrasporangia one or two at the tip of an erect filament, 

 eruciately divided. 



Forming irregular patches in the frond of Grateloupia Gut- 

 leriee. West coast of Whidbey Island, Wash., N.L.G., Nos. 

 289!, 289a! 



This minute, somewhat immersed species differs from any- 

 thing that has been described, unless it be Callith amnion humile 

 Kuetzing, figured in the Tabula; Phycologicaa (Vol. 11 pi. 58, I) . 

 A careful comparison with the original will be necessary to 

 determine whether they are the same or not. 



