vol.i] SetcMll- Gardner. — Alga 1 of Northwestern America. 197 



Prince William Sound, Alaska, Saunders, No. 300! (1901, p. 399) ; 

 Glacier Bay, Alaska, Saunders (1901, p. 399). 



Stigonema minutum (Agardh) Hassall. 



On damp rocks. Prince William Sound, Alaska, Saunders 

 (1901. p. 399). 



Family RIVULARIACE^E. 



Calothrix consociata (Kuetziug) B. & F. 



On grasses, etc., in a salt marsh. Head of Penn's Cove, near 

 Coupeville. Whidbey Island, Wash., N.L.G., No. 548! 



From its diameter and coloration of sheath, the number 

 quoted above seems to belong here. The species seems to 

 partake of the characters of both C. confervicola (Roth) Agardh 

 and C. scopulorum (Weber et Mohr) Agardh, but with much 

 wider sheaths than either species has according to description. 



Calothrix scopulorum (Weber et Mohr) Agardh. 



In salt water. Pnget .Sound, Saunders (1901, p. 399). 



Calothrix pulvinata (Mertens) Agardh. 



On sticks and old wood, in salt marshes. Whidbey Island, 

 Wash., N.L.G., Nos. 303!, 560!, and in Collins, Holden and 

 Setchell, P. B.-A, No. 957! 



Calothrix Crustacea Thuret. 



Floating, on rocks, clay banks, wood, etc., in brackish lagoon. 

 Whidbey Island, Wash., N.L.G., Nos. 302!, 421!, 583!; Key- 

 port, Kitsap County, Wash., N.L.G., No. 494! 



This is a very variable species, especially concerning the 

 matter of branching. While most of the fdaments are simple 

 and typical, there are intermingled, particularly in No. 583, 

 filaments branched in such a way as to properly come under 

 C. prolifera Flahault, V. faseiculata Agardh, and even G. vivipara 

 Harvey. No. 494 grew on a clay bank above high water mark, 

 and represents a very depauperate form of the species. 



Calothrix fusca (Kuetzing) B. & F. 



Occurring singly or few together in the jelly of other species 

 of algse. Near Iliuliuk, Unalaska, Alaska, W.A.iS'. and A.A.L., 



BOT.-14. 



