322 ALLAN HANCOCK PACIIIC EXPEDITIONS VOL. 12 



PLATE 3 



Figs. 1-8. Sphacchiria mi'xicana. Figs. 1-3, propagulae on their 

 supporting branches, sho\ving the two short arms and 

 the stalk articulation. Fig. 4, a propagulum on a branch 

 viewed from the lower margin. Figs. 5, 6, two detached 

 propagulae showing progressive elongation of the arms 

 in germination. Fig. 7, a detached propagulum viewed 

 obliquely from below. Fig. 8, a portion of a filament 

 apparently showing two empty sporangia, x 155. Is. 

 Reviiia Gigedo. 



Figs. 9-16. Carpomitra luxtirians. Figs. 9, 10, branched paraphyses 

 with expanded end cells. Figs. 11-16, paraphyses with 

 sporangia in various stages of development, and empty 

 sporangial sacs, x 330. I. Santa Maria. 



Figs. 17-21. Spermothamnion phycnphilitm. Fig. 17, a small portion of 

 a basal filament with haptera and three erect filaments. 

 Fig. 18, upper part of a tetrasporangial filament to show 

 unilateral seriate sporangia, and the progressive devel- 

 opment of branched sporangial clusters. Figs. 19, 20, 

 portions of older filaments to show well-developed spo- 

 rangial clusters. Fig. 21, tip f)f a male filament to show 

 unilateral seriate spermatangial clusters; the forked 

 character is unusual, and the series are usually longer, 

 on a simple filament, x 70. I. Santa Maria. 



