vol. ij Setchell— Gardner. — Algce of Northwestern America. 193 



The filaments are 6 ^ in diameter, and the spores are 8 ^ in 

 diameter. 

 Nodularis armorica Thuret? 



Floating on the surfaces of quiet ponds. Near Coupeville, 

 WMdbey Island. Wash., X.L.G., No. 602!; Port Townsend. 

 Wash., X.L.G.. No. 436! 



The specimens referred somewhat doubtfully to this species 

 seem intermediate between it and JV. sphcerocarpa B. & F. The 

 filaments are 10 ^ in diameter, while the trichomes are 6 /* in 

 diameter. The spores are nearly spherical and show some indi- 

 cations of biconcave dissepiments. They measure, in the riper, 

 but not yet fully mature ones, 9-10 f- by 6-7 /*. 



Nodularia spumigena f. major (Kuetzing) B. & F. 



In a pond of slightly brackish water. Penn's Cove, near 

 Coupeville. WMdbey Island, Wash., X.L.G., No. 411! 



The spores in the number quoted above are scanty and mostly 

 young. Some which are nearly l'ipe, measure 17-18 /"■ by 7-8 m. 



Cylindrospermum licheniforme (Bory) Kuetzing. 



On mud or moist sand. Near Oak Harbor, Whidbey Island, 

 Wash.. X.L.G.. No. 600!; near Mt. Vernon, Skagit County, 

 X.L.G.. No. 332! ; near Seattle, Wash., X.L.G., Nos. 367! , 391! 



The specimens quoted above seem to be typical forms of this 

 species. Gardner has collected a specimen (No. 335, LaConner, 

 Skagit County, Wash.,) which also comes very close to it, but the 

 ripe spores are only 15m by 7 m. 



Cylindrospermum muscicola Kuetzing. 



In a small stream of running water. Orcas Island, Wash., 

 X.L.G.. No. 474! 



The ripe spores are 18 /* by 10 p and are more oval than 

 oblong. 



Cylindrospermum catenatum Ralfs. 



Floating in quiet water of a stream. Tracyton, Kitsap County, 

 Wash.. Tilden, No. 395! 



The material in this number is excellent, but it is difficult to 

 find spores in position. They appear to be in chains and answer 

 to the description of those of this species. 



