212 CALIFORNIA ACADEMY OF SCIENCES. [Proc. 3D Ser. 



Localities. — St. Paul, Kadiak Island, Alaska (W. A. 

 Setchell and A. A. Lawson, No. 5H9-); Coupeville, 

 Washington (N. L. Gardner!); Bolinas Bay, Marin 

 County, California (W. A. Setchell, No. 1275!); Monte- 

 rey Bay, California (W. A. Setchell, No. 3065a!; C. L. 

 Anderson!); San Pedro, California (de A. Saunders!). 



8. Porphyra naiadum Anderson. 



Plate XXI, Figs. 19-22. 

 Zoe, Vol. Ill, 1892, p. 148. 



Porphyra naiadum Anderson, Zoe, Vol. Ill, 1892, p. 148. Howe, Erythea, 

 Vol. I, 1893, p. 67. McClatchie, Proc. So. Cal. Acad., Vol. I, 1897, 

 p. 356. TiLDEN, Amer. Algce, Cent. Ill, No. 231, 1898. Setchell in 

 Phyc. Bor.-Amer., Fascl. XIII, Collins, Holden & Setchell, No. 

 632, 1899. Hus, Zoe, Vol. V, 1900, p. 66. 



Porphyra coccinea Agardh, J. G., Till. Alg. Syst., Afd. 3, VI, 1882, p. 58; 

 in part (as to the Californian specimens ?). 



Porphyra sp. Ruprecht, Neue oder unbek. Pflan. d. N. Th. d. .St. Oceans, 

 1852, p. 65. 



Fronds 2-T0 cm. long, obovate when young, oblanceolate when older; 

 base cushion-shaped; fronds wine-red to blue-purple; monostromatic, vege- 

 tative part 25-3o,a thick, cells square or slightly higher than broad, 15-20/1 

 high; surface jelly measuring about 5/1, little jelly between the cells; fronds 

 direcious ? ; sporocarps with eight carpospores. 



The first mention of this species of Porfhyra was prob- 

 ably made by Ruprecht (1852), who speaks of a parasitic 

 Porphyra occurring on Phyllospadix scouleri. It was first 

 recognized as a distinct species by Dr. Anderson in 1892; 

 but for reasons given below it is evident that it was known 

 before that time to J. G. Agardh. Formerly it had been 

 distributed along with P. nereocystis and P. perforata as 

 P. vulgaris, but, as Dr. Anderson says, "without much 

 more reason than our early botanists had for placing all sea- 

 weed in the genus Fuciis.'' It is found growing on Phyllo- 

 spadix at extreme low-water mark, and in sheltered and 

 exposed places alike. The plants occurring on a single 

 blade of eel-grass are usually so numerous that the color of 

 the adult fronds literally hides the green color of the eel- 

 grass. It is interesting to note that most of the fronds 



