216 University of California Publications. [botany 



consult Miss Reed's paper on the subject (Univ. of Calif. Publi- 

 cations, Botany, Vol. 1). 



Prasiola fluviatilis (Sommerfelt ) Aresckoug. 



Point Barrow, Alaska, Farlow (1885, p. 192)! 



This is what Farlow refers doubtfully to P. crispa in the refer- 

 ence cited above. A specimen from Herb. Farlow in the U.S. 

 National Herbarium is labelled P. crispa f. maximal , but a speci- 

 men sent to us from Herb. Farlow, labelled as above, seems to 

 us properly referred. 



Family ULOTHPJCHACEJK. 



Ulothrix subtilis Kuetzing. 



In slightly brackish water, Victoria, B. C, N.L.G., No. 338! ; 

 in fresh water, LaConner, Skagit County, Wash., N.L.G., No. 

 315! 



The determination of these specimens is not absolutely cer- 

 tain, but they seem to belong to the typical form (f. genuina 

 Kirchner) of this species. 



Ulothrix zonata ( Weber et Mohr) Kuetzing. 



Forming yellowish green, almost gelatinous patches on rocks 

 wet with abundant spray. Cascade near Iliuiiuk, Unalaska, 

 Alaska, W.A.8. and A.A.L., No. 4046!, 5033! 



The plants listed under this species were most beautiful in 

 their growth and came from the very same spot, the earlier number 

 having been collected on June 30, 1899, and the later number on 

 August 10, 1889. • 



The determination was made by T. E. Hazen through the 

 kindness of Mr. Collins. 



Ulothrix tenuis Kuetzing. 



Among the roots and leaves of grasses, slightly inundated, 

 side of a rill. Near Iliuiiuk, Unalaska. W.A.8. and A.A.L., 

 No. 5012a! 



Determined by T. E. Hazen. through the kindness of Mi'. 

 Collins. 



