180 University of California Publications. [botanv 



Aphanocapsa Castagnei (Knetzing) Rabenhorst. 



In fresli or sulpliiu' waters. Point Barrow, Alaska, Farlow 

 (1885, p. 192); Ravenna Park, Seattle, Wash., N.L.G., No. 

 400! 



Aphanothece stagnina (Sprengel) A. Brann. 

 Point Barrow, Alaska, Farloiv (1885, p. 192). 



Aphanothece microspora Rabenhorst. 



On dripping rocks. Juneau, Alaska, Sannders (1901, p. 397). 



Aphanothece Castagnei (Brebisson) Rabenhorst. 



In a jar of water in the laboratory. University of Washing- 

 ton, Seattle, Wash., N.L.G., No. 590! 



The determination is not without some doubt, but the meas- 

 urements seem to coincide with those given for this species. 



Microcystis marginata (Meneghini) Knetzing. 



Forming slimy coatings on dripping rocks. Glacier Valley, 

 Unalaska, Alaska, A.A.L., No. 5023a!; Juneau, Alaska, Saun- 

 ders (1901, p. 397). 



The Unalaska specimen seems to belong here although the 

 cells are often twice as long as broad. A consultation of Mene- 

 ghini's figure (1846, pi, 13, f. 1 and la) will show a similar 

 variation. The habit is very strongly of this species. 



Gomphosphaeria aponina Knetzing. 



Floating intermingled with other algfe in brackish waters. 

 Whidbey Island, Wash., N.L.G., Nos. 296!, 301!, 472! 



Oncobyrsa Cesatiana Rabenhorst. 



Plentiful on water-moss in running fresh water. Near Iliuliuk, 

 Unalaska, Alaska, W.A.S. and A.A.L., No. 5036! 



These plants appeared as small, golden yellow, nearly spherical 

 colonies at a place in the rivulet where the water was most 

 rapidly flowing. 



Family CHAM.^SIPHONIACE^. 



Xenococcus Schousbcei Thuret. 



On various filamentous Cyanophycea3 and Chlorophycea^' in 



