vol.i] Setchell- Gardner. — Alga of Northwestern America. 209 



been examined belong to Eosenvinge's var. typica. No. 531 is 

 the form known as M. Blyttii. 



Monostroma fuscum var. splendens (Ruprecht) Rosenvinge. 



On stones in the middle literal zone. St. Paid Island, Alaska, 

 Townsend, No. 5785!, Greeley and Snodgrass, No. 5800! (cf. 

 Setchell, 1899, under M. splendens) ; west shore of Amaknak Island, 

 Bay of Unalaska, Alaska, W.A.S. and A.A.L., No. 3261!, and 

 in Collins, Holden and Setchell, P. B.-A., No. 911! ; Pinnacles, 

 near Summer Bay, Unalaska, Alaska, A.A.L., No. 4097! ; Lowe 

 Inlet. Alaska, Saunders (1901, p. 409, under M. splendens). The 

 variety, which is the original Ulva or Ulvaria splendens Ruprecht, 

 is to be distinguished from the var. typica, according to Rosen- 

 vinge, by the thickened external wall. 



Monostroma leptodermum Kjellman. 



Forming a dense growth on Zostera, in shallow water. 

 Between Brown and San Juan Islands, Wash., Tilden, No. 388! , 

 under Monostroma zostericolum . 



Mr. Collins reports that this is the same plant as found grow- 

 ing on the New England coast and listed by him (1900, p. 44), 

 and that it agrees in all respects with the description and figures 

 of KjeUman (1877, p. 52, fig. 23, 24). Rosenvinge (1893, 

 p. 944 and 1894, p. 149), however, figures a plant under Kjell- 

 man's name which has a long tubular stipe which is lacking in 

 the New England specimens, and also in the specimens of Miss 

 Tilden. Kjellman's plants lacked the base. The question is, 

 whether the plant of Rosenvinge or our plant is the plant of 

 Kjellman. Mr. Collins prefers to believe that our plants are 

 M. leptodermum and that Rosenvinge's belong to another and 

 probably to a new species. 



Ulva Lactuca var. rigida (Agardh) LeJolis. 



In various situations. St. Lawrence Island, Alaska, Kjell- 

 iiiiih (1889, p. 53, under U. rigida); Pathfinder Rock, Norton 

 Sound, Alaska, B. G. McGregor, No. 5680! ; St. Michael, Alaska, 

 W.A.S. , No. 5237x!, 5245y!; Shumagin Islands, Alaska, 

 Saunders (1901, p. 410); Harvester Island, Uyak Bay, Alaska, 

 W.A.S. and A.A.L., No. 5116!; Virgin Bay, Prince William 



