BOT.— Vol. II.] HUS—PORPHYRA. 207 



Habitat. — On rocks, wood and barnacles. Epiphytic on 

 Zostera, Phyllospadix , Nitophyllum, Fiicus and Gigartina. 

 Throughout the litoral and in the upper part of the sublitoral 

 zones. Found throughout the year, but during the winter 

 months in sheltered places only. 



Disti'ihtttion. — At present known from the Pacific Coast 

 only, from Alaska to Southern California (58^^ 30^-32^ 20' 

 N. lat.). 



Localities. — Glacier Bay, Alaska (de A. Saunders, No. 

 100!); Baranoff Island, Alaska (de A. Saunders, No. 

 130!); Shumagin Island, Alaska (de A. Saunders, No. 

 394!); Whidby Island, San Juan County, Washington (N. 

 L. Gardner, No. 295!); Chehalis Bay, Washington (Ralph 

 Emerson, No. 1792!); Crescent Cit}^, Del Norte County, 

 California (H. Hus!); Trinidad, Humboldt County, Cali- 

 fornia (H. Hus!); Duxbury Reef , Marin County, California 

 (W. A. Setchell, No. 1055!, H. Hus, No. 81!); Farallon 

 Islands, California (H. Hus!) ; Lands' End, San Francisco, 

 California (W. A. Setchell, No. 2034!, No. 2068!, H. Hus, 

 No. 26!, No. 69!, et al.); Santa Cruz, California (C. L. 

 Anderson!); Monterey, California (W. A. Setchell, No. 

 5159!, H. Hus!) ; San Simeon Bay, California (Dr. Palmer ! ) ; 

 Santa Barbara, California (Mrs. Cooper!); San Diego, Cali- 

 fornia (Miss Reed, No. 25!); Coronado, California (Mrs. 

 M. S. Snyder!). 



5. Porphyra perforata f. segregata Setchell & Hus. 



Zoe, Vol. V, 1900, p. 64. 



Porphyra perforata f. segregata Setchell & Hus, Zoe, Vol. V, 1900, 

 p. 64. Snyder, in Phyc. Bor.-Amer., Fascl. XIV, Collins, Holden & 

 Setchell, No. 684, 1900. 



Porptiyra leucosticta Tilden (not Thuret), Amer. Algce, Cent. Ill, No. 

 228, 1898. 



This plant agrees in many respects with the species, but 

 there are some fundamental differences, which, though they 

 do not entitle it to a separate specific name, make it desir- 

 able to distinguish it as a distinct variety. As a rule the 

 plant is much smaller and has a rather more umbilicate base 



