Box.— Vol. II.] 



HUS—PORPHYRA . 



195 



P. occidcntalis has been found in but a single locality, 

 Monterey Bay, California (36° 45' N. lat.). 



Distribution of the Pacific Coast Species of Porphyra. 



IV. Descriptions of Species. 

 Key to the Pacific Coast Species of Porphyra. 



Fronds monostromatic ^ 



Fronds distromatic ^ 



Fronds monostromatic or distromatic ^ ^ 



Base cushion-shaped, consisting of parenchymatous cells. . P. naiadum 



Base discoid, consisting of agglutinated, rhizoid-like cells 3 



Thirty-two spores in each sporocarp 4 



Eight spores in each sporocarp 



Fronds monoecious ^ 



Fronds dioecious P. perforata i. lanceolata 



Fronds brown-purple, 45-150/-^ thick P- perforata 



Fronds brown-purple, 60// thick, with thick partition walls 



P. perforata f. segregata 

 Fronds red-purple, 25-60// thick, with thin partition walls. .P. nereocystis 



„ J „ ; .,^ P- leucosticta 



Fronds monoecious ■' . . 



„ , J. • P. lacimata 



Fronds dioecious 



