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



than p. perforata. The frond is much thinner, never ex- 

 ceeding sixty microns. The vegetative cells are smaller 

 than those of the species, and the jelly walls separating the 

 different cells are thicker, giving the vegetative portion of 

 the frond when seen in surface view a most characteristic 

 appearance. 



The difference between the reproductive cells of P. per- 

 forata and this variety can be best seen in cross-section. 

 It is especially noticeable in case of the antheridia. The 

 wall laid down by the first reproductive division of the 

 antheridium is very thick and widely separates the anther- 

 ozoids into an upper and a lower group. 



Distribution. — From Washington southward to Lower 

 California (47° 3o'-27° 8>^' N. lat.). 



Localities. — Shillshole Bay, Seattle, Washington (Miss 

 J. E. Tilden!); San Pedro, California (de A. Saunders, 

 No. 1034!); San Diego, California (Mrs. M. S. Snyder!); 

 San Roque, Mexico (G. Eisen!). 



6. Porphyra perforata f. lanceolata Setchell & Has. 



Zoe, Vol. V, 1900, p. 65. 



Porphyra perforata f. lattceolata Setchell & Hus, Zoe, Vol. V, 1900, p. 65; 



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



683, 1900. 

 Porphyra laciniata Tilden, Amer. Algae, Cent. Ill, No. 229, 1898. 



Membranous; 10-325 cm. long, i-io cm. broad; linear with undulate mar- 

 gin; base cuneate to cordate, attached by a disc; steel-gray to gray- or yellow- 

 brown, becoming purple on drying; monostromatic, vegetative part of frond 

 75-150/^1 thick; cells one and one-half to four times as high as broad; jelly 

 very thick, forming two-fifths to one-half the thickness of the frond; dioe- 

 cious; sporocarps containing 32 carpospores, each antheridium containing 

 128 antherozoids. 



This variety of P. -perforata agrees in many respects 

 with the species. The chief difference Hes in the fact that 

 it is dioecious. Besides this there are numerous minor 

 differences. 



P. -perforata f . lanceolata can be distinguished at first 

 sight from the species by its form. This is either distinctly 



