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



Sporocarps. — The reproductive bodies of P. laciniata 

 belong to the P. Icucosticta type. Each sporocarp contains 

 eight carpospores, which arise from the vegetative cell by a 

 cruciate division, followed b}'^ a parallel division, thus giving 

 rise to eight carpospores in two tiers of four each. This 

 appears to be the normal number, but frequently this mode 

 of division undergoes changes Either the vegetative division 

 proceeds one step further and only a parallel division takes 

 place, thus giving rise to but two spores, or in the latter case 

 an additional parallel division may occur, so that the sporo- 

 carp contains four carpospores in four tiers of one each. 

 Again it is possible that after the normal cruciate and par- 

 allel divisions have taken place, another more or less com- 

 plete division, usually parallel or oblique, forms sixteen or 

 less carpospores. 



Antheridia. — The antheridium-mother-cell first undergoes 

 a cruciate division, giving rise to four antheridia. Each 

 antheridium now undergoes its first reproductive division, 

 parallel to the surface of the frond. This division is fol- 

 lowed by a cruciate division and by a division parallel to the 

 surface of the frond, in all segments, thus giving rise to 

 sixteen bodies in four tiers of four each. These bodies 

 divide by a cruciate division, giving rise to 64 antherozoids. 

 This division is in many cases followed by a division parallel 

 to the surface of the frond, so that each antheridium now 

 contains 128 antherozoids arranged in eight tiers of 16 each. 



The drawings of P. laciniata of Bornet and Thuret 

 (1878) admirably illustrate these points, as well as those 

 cases where the vegetative division of the antheridium- 

 mother-cell is less apparent; so that we find 256 or 512 

 antherozoids in an antheridium, or where the vegetative 

 division of the antheridium-mother-cell goes one step farther 

 so that each antheridium contains but 32 antherozoids. 



Economic Use. — According to the Rev. Albin Johnson, 

 the Indians of Yakutat, Alaska, collect, cook and eat this 

 plant. 



Habitat. — On rocks or epiphytic on Fiicus evanescens. 

 Throughout the litoral and lower litoral zones. 



