342 Universal/ of California Puhlicaiioni^. [botany 



floccosioii var. Pacificum; Pleasant Beach, Kitsap County, Wash., 

 X.L.G., No. 346! 



This form, which is abundant on the western coast of North 

 America, grows in dense tufted masses. It is to be recognized 

 by its long, simple, subulate branchlets. 



Antithamnion Americanum (Harvey) Kjellman. 



On stems of Nereoc^-stis and on wood, in the upper sulilitoral 

 zone. Esquimalt, B. C, Hdrvei/ (1862, p. 175, under Colli- 

 thamnion America>nnii ) ; Friday Harbor, San Juan Island, Wash., 

 N.L.G., No. 502! 



The specimen from San Juan Island is referred here with 

 some doubt. The tetrasporaugia are secund on the lu-anchlets, 

 but they are also provided with a unicellular pedicel. 



Antithamnion Pylaisaei (Montague) Kjellman. 



On Nereocystis and on wood, upper suljlitoral zone. West 

 coast of Whidl)ey Island, Wash., N.L.G., Nos. 72! , 447! , 453! ; 

 Friday Harbor, San Juan Island, Wash., X.L.G., No. 503! 



The specimens referred here have a more verticillate habit 

 than the last, and are more slender than the next. They seem 

 t(^ be distinguished better by habit than hy any microscopical 

 character. 



Antithamnion Pylaisaei f. Norvegica Kjellman. 



Floating. Ludlow Bay, Jefferson County, Wash., X.L.G., 

 No. 438! 



Agrees well with Kjellman's figure (1883, pi. 16, f. 1). 



Antithamnion subulatum (Harvey) J. Agardh. 



On larger alga'. Esquimalt, B. C, Hurrty (1862, p. 175, 

 under CaUifhamnioii suhuhdum) ; Port Renfrew, B. ('., Huiler 

 and Pollen, No. 40, and in Collins, Holden and Setchell. P. B.-A., 

 No. 944!; Vancouver Island, B. C, G. W. Lichteiithahr (in 

 Herb. P. S. Collins); west coast of Whidbey Island, Wash., 

 N.L.G., No. 922! 



A coarser species tlian the preceding and with the })innules 

 provided with short subulate lateral branches. The type seems 

 to have disappeared, since Professor W. G. Farlow has searc-hed 



