300 



ALLAN HANCOCK PACIFIC EXPEDITIONS 



VOL. 12 



These plants agree rather well with Setchell & Gardner's description 

 (1930, p. 162), except that they are much taller. Trichoblasts were not 

 rare on material which had been mounted on mica from the fresh state, 

 but were very inconspicuous and simple. The pericarps were not included 

 in the original description ; they vary a good deal in form and most gen- 

 erally are nearly turbinate, though a few large ones are wider nearer the 

 base than the apex. The pore is large and its margin irregular. 



Mexico: Is. Revilla Gigedo, dredged in abundance at sta. 129 from 

 25-32 meters' depth, Braithwaite Bay, I, Soccoro, no. 34-21 (tetrasporic 

 and cystocarpic) , 2 Jan. 1934. 



Text Figure 2. Polysiphonia bifurcata. The apical portion of a 

 branch system showing the strongly incurved tips and the absence of 

 trichoblasts. Drawn by G. J. Hollenberg. x 435. I. Espafiola. 



