2IO CALIFORNIA ACADEMY OF SCIENCES. [Proc. 3D Ser. 



Habitat. — P. perforata f . lanceolata is an annual, occur- 

 ring throughout the year, but in winter found only in shel- 

 tered places. It usually grows on rocks in the highest part 

 of the literal zone. In some cases it has been found on but 

 a single rock for a distance of over a mile. This was in 

 December, but the rocks in the same locality (Fort Point, 

 Presidio, San Francisco) were found to be thickl}^ covered 

 with it in June of the next year. 



DistribtUion. — Up to now this plant has, to the author's 

 knowledge, been found in but two localities, both in Cali- 

 fornia (37° 47-36° 45' N. lat.). 



Localities. — Lands' End, San Francisco, California (W. 

 A. Setchelll, H. Hus!, R. E. Gibbs, Miss J. E. Tilden!); 

 Carmel Bay, Monterey County, California ( W. A. Setchell ! , 

 R. E. Gibbs!). 



7. Porphyra nereocystis Andei-son. 



Plate XX, Figs, iia-12. 

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



Porphyra nereocystis Anderson, Zoe, Vol. II, 1891, p. 221, (name only); 



Vol. Ill, 1892, p. 149 (descr.). Howe, Erythea, Vol. I, 1893, p. 67. 



Setchell, in Holden, Collins & Setchell, Phyc. Bor.-Amer., Fascl. 



XII, No. 583, 1S99. Hus, Zoe, Vol. V, 1900, p. 65. 

 Pyropia calif ornica ]. G. Agardh, Anal. Algol., Cont. V, 1899, p. 153. 



Fronds 3-270 cm. long, 2-40 cm. broad, linear to oblong, with laciniate 

 margin and obtuse or cucullate base; aUached by a disc; fronds red to purple, 

 monostromatic, vegetative part 25-60/x thick, little jelly between the cells; 

 fronds monoecious, antheridia forming light-colored, sharply defined spots 

 and streaks among the dark-colored sporocarps, 32 carpospores in each 

 sporocarp, 128 antherozoids in each antheridium. 



This species, first mentioned by Dr. Anderson of Santa 

 Cruz, California, is one of the largest of known species of 

 Porfhy7-a. It attains a great length, specimens 90 centi- 

 meters long being b}^ no means rare. From notes appended 

 to a fragment of one specimen it was gathered that the 

 whole specimen measured 270 centimeters. The shape is 

 fairly constant. The younger specimens are lanceolate 

 and have an even margin. Older specimens are oval and 



