63 

 of the basai layer, simple, several cells high with the cells longer 

 than broad. Tetrasporangia elongated, arising from the basai celi 

 of a vertical filament, transversely septate (zonate), not projecting 

 beyond the tips of the vertical fìlaments. Antheridia and cystocarps 

 unknown. 



A genus differing from Cruoria Fries, only in its parasitic habit 

 and consequent possession of rhizoidal fìlaments penetrating the 

 host-plant. 



P. epiphytìca Setchell and Lawson mscr. (Phyc. Bor.-Amer., 



N. 1049). Thickly parasitic on the fronds of Callymenia-sp. 



Cast ashore in the neighborhood of Monterey, California. Col- 

 lected by Mrs. J. M. Weeks and by W, A. Setchell. 



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