290 University of California Publications. [botany 



fairly large plant, but No. 322 is nearly 4 meters long and 1.5-2 

 meters wide, one of the largest of known Porphyras. 



To this species are probably to be referred the plants men- 

 tioned under P. vulgaris, as follows: Esquimalt, B. C, Harvey 

 (1862, p. 176) and Puget Sound, Bailey and Harvey (1862, p. 

 163). 



Porphyra perforata f. segregata Setehell and Hus. 



On rocks. West coast of Whidbey Island, Wash., N.L.G., 

 No. 66! ; Seattle, Wash., Tilden, No. 228!, under P. leucosticta. 



This is a dwarf form, with thickened cell walls and the upper 

 and lower halves of the contents of the autheridia separated by 

 a thick gelatinous wall. 



Porphyra Nereocystis C. L. Anderson. 



On Nereocystis Luetkeana. Harvester Island, Uyak Bay, 

 Kadiak Island. Alaska, W.A.8. ami A.A.L., No. 5112!; St. 

 Paul, Kadiak Island, Alaska, fy.A.S. and A. A. L., No. 5149!; 

 Whidbey Island, Wash., A. L.G.I 



This species may be known from forms of the preceding species 

 by its red color, usually thinner frond, and by the arrangement 

 of the sporocarps and antheridia which do not form the narrow 

 elongated more or less linear patches of P. perforata. 



Porphyra naiadum f. minor Hus. 



On leaves of Phyllospadix. Port Renfrew, B. C, Tilden, 

 No. 516!, Butler and Pollen, No. 47. 



Porphyra naiadum f. major Hus. 



On the leaves of Zostera. West coast of Whidbey Island, 

 Wash., N.L.G., Nos. 182!, 183!, 273! ; Brown Island, San Juan 

 County, Wash., Tilden, No. 231b!; Seattle, Wash., Tilden, No. 

 231a! (a very poor specimen.) 



P. naiadum is a very distinct species on account of the 

 cushion-shaped parenchymatous prothallus, as has been shown 

 by Hus ( 1902 ) . 



Porphyra amplissima (Kjellman) Setehell and Hus. 



On rocks, upper sublitoral zone. Amaknak Island, Bay of 

 Unalaska, Alaska, W.A.8. and A.A.L., No. 3268!; Unga, 



