192 Universitij of California Fitblicatioiis. (botany 



Anabaena sphaerica B. & F. 



Floating' on the surfaces of small ponds. Wliidbey Island, 

 Wash., N.L.G,, No. 462!; Port Townseud, Wash., X.L.G., 

 No. 486! 



The filaments are agglutinated together in ])arall('l bunches; 

 the spores are very nearly spherical and 10 i^ 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., X.L.G., No. 387! 



The filaments are circinate and agree with those of this species 

 in every way, but the plants are all sterile and consequently the 

 determination cannot be absolutely certain. 



Anabaena catenula (Kuetzing) B. & F. 



Floating on shallow j^ouds or sluggish streams. Huntville, 

 Unalaska, Alaska, W.A.S. and A.A.L., No. 4095?; Glacier Val- 

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

 ville, Whidbey Island, Wash., X.L.G., No. 605!; (^reen Lake, 

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



The Unalaska specimens are somewhat doubtful, since they 

 seem to approach too near to the following. ])ut are i)r()balily 

 forms of the present with spores adjacent to the heterocysts. 



Anabaena oscillarioides Bory. 



Floating on pools and lakes, or on moist ground. Cou])e- 

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

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

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

 436! 



No. 436 is a slender form with tridiomes not over 4 m in 

 diameter and with spores not over 30 /^ long. i>erhai)s Ix-longing 

 to the var sfenospora. 



Nodularia Harveyana (Thwaites) Thuret. 



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

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



