190 University of California Publications. [botany 



Nostoc carneum Agardh. 



Forming brown floating masses of jelly on surface of streams. 

 Glacier Valley, Unalaska, Alaska, A.A.L., Nos. 5020 a and b!, 

 5026! ; Green Lake, Seattle, Wash., F.L.G., No. 587! 



Nostoc spongiaeforme Agardh. 



Floating in a small pool of fresh water. Edge of Green Lake, 

 Seattle, Wash., X.L.G., Nos. 383!, 585! 



No. 383, collected in May, 1901, has no spores, but No. 585, 

 collected in the same pool in July, 1901, has an abundance of 

 young spores. 



Nostoc muscorum Agardh. 



Forming soft gelatinous lumps and masses of various shapes, 

 on rocks among mosses. Amaknak Cave, Amaknak Island, Bay 

 of Unalaska, Alaska, W.A.8. and A.A.L., No. 3295!; near 

 Iliuliuk, Unalaska, Alaska, W,A.S. and A.A.L., No. 4085!; 

 moist ground just above high water mark, Whidbey Island, 

 Wash., N.L.G., No. 422? 



The last number is young and shows no spores. No. 394, 

 Tilden, American Algae, collected at Port Renfrew, B. C, is too 

 scanty for determination, but what there is shows a frond too 

 tough to belong to this species, but which, in consistency at 

 least, approaches the following. 



Nostoc commune Vaucher. 



Assuming various shapes, from discoid thalli to flat expan- 

 sions of considerable extent, on soil or on rocks. St. Michael, 

 Alaska, W.A.S., No. 5157y! ; Iliuliuk, Unalaska, W.A.iS. and 

 A.A.L., No. 4030! ; near Hidden Glacier, Yakutat Bay, Alaska, 

 Saunders (1901, p, 397); near Glacier Bay, Alaska, Saunders 

 (1901, p. 397); Whidbey Island. Wash., N.L.G., Nos. 376!, 

 611! 



Nostoc expansum Harvey and Bailey. 



Puget Sound, Harvey and Bailey (1851, p. 372), Bailey and 

 Harvey (1862, p. 164, pi. 6, f. 1, 2). 



This species seems to be unknown, but must be near to, if 

 not identical with the preceding. 



