192 University of California Publications. [Botank 



Anabaena sphaerica B. & F. 



Floating on the surfaces of small ponds. Whidbey Island, 

 Wash., N.L.G,, No. 462!; Port Townsend, Wash., N.L.G., 

 No. 436! 



The filaments are agglutinated together in parallel bunches; 

 the spores are very nearly spherical and 10 p broad; they begin 

 to form near one heterocyst and proceed in their formation, 

 toward the other. In general, the plants noted above come very 

 near to this species, at least. 



Anabaena Flos-aquae (Lyngbye) Brebisson. 



Floating on great abundance on quiet water. Lake Union, 

 Seattle, Wash., N.L.G., No. 387! 



The filaments are circinate and agree with those of this species 

 in every w r ay, but the plants are all sterile and consequently the 

 determination cannot be absolutely certain. 



Anabaena catenula (Kuetziug) B. & F. 



Filiating on shallow ponds or sluggish streams. Huntville, 

 Unalaska, Alaska, ir..4.,S r . and A.A.L., No. 4095?; Glacier Val- 

 ley, Unalaska, Alaska, A.A.L., Nos. 5022?, 5028?; near Coupe- 

 villc, Whidbey Island, Wash., N.L.G., No. 605!; Green Lake, 

 Seattle, Wash., N.L.G., No. 380! 



The Unalaska specimens are somewhat doubtful, since they 

 seem to approach too near to the following, but are probably 

 forms of tin- present with spores adjacent to the heterocysts. 



Anabaena oscillarioides Bory. 



Floating on pools and lakes, or o« moist ground. Coupe- 

 ville, Whidbey Island, Wash., N.L.G., No. 462! ; Seattle, Wash.. 

 N.L.G., Nos. 352!, 353!, 372!, and in Collins, Holden and Set- 

 chell, P. B.-A., No. 907!; Port Townsend, Wash., N.L.G., No. 

 436! 



No. 436 is a slender form with trichomes not over 4 ^ in 

 diameter and with spores not over 30 /* long, perhaps belonging 

 to the var stenospora. 



Nodularia Harveyana (Thwaites) Thuret. 



On mud by the roadside. Near LaConner, Skagit County, 

 Wash., N.L.G., No. 335! 



