198 University of California Publications. [botany 



No. 4032! ; Kadiak Island and Cook Inlet, Alaska, Saunders 



(1901, p. 399). 



Calothrix parietina (Na?geli) Thuret. 



Forming reddish brown patches on dripping rocks. Amaknak 

 Cave, Amaknak Island, Bay of Unalaska, Alaska, W.A.S. and 

 A.A.L., No. 3294! 



Calothrix Braunii B. & F. 



On pebbles at edge of lake. Lake Union, Seattle, Wash., 

 Tilden, No. 286b! 



Miss Tilden has distributed two specimens under this name 

 and number. No. 286a, growing on dead floating stems of 

 Scirpus, has intercalary heterocysts and false branching. It 

 seems to be a species of Tolypothrix. No. 286b seems to 

 represent a form of C. Braunii with slender trichomes (4-5 /"• in 

 diameter) and sheaths becoming yellowish brown. 



Dichothrix Baueriana (Grunow) B. & F. 



On dripping rocks or stones in running or quiet water. Near 

 Iliuliuk, Unalaska, Alaska, W.A.S. and A.A.L., No. 4043!; 

 Orca, Alaska, W. L. Jepson, Nos. 5173x1,5175!; Whatcom, 

 Wash., N.L.G., No. 608! 



Isactis plana var. fissurata B. & F. 



On stones. Captains Bay, Unalaska, Alaska, A.A.L., No. 

 5013a! 



Rivularia Biasolettiana Meneghini. 



On dripping rocks, on roots, etc., in fresh or brackish water. 

 West shore of Amaknak Island, Bay of Unalaska. Alaska, 

 W.A.S. and A.A.L., No. 4005!; at mouth of creek, Iliuliuk, 

 Unalaska, Alaska, W.A.S. and A.A.L., No. 4015! ; Glacier Bay r 

 Alaska, Saunders, No. 102! (1901, p. 399); Juneau, Alaska, 

 Saunders, No. 76! (1901, p. 399); Port Renfrew, Vancouver 

 Island, B.C., Tilden, Nos. 570! , 571! (the latter under R. nitida); 

 East Sound, Orcas Island, Wash., N.L.G., No. 496! 



Rivularia nitida Agardh. 



On mud near high water mark. St. Michael, Alaska, W.A.S. 

 No. 5249x! 



