320 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 12 



PLATE 2 



Figs. 1-6. Dcrhesia prolifica. Figs. 1, 2, tips of two filaments, each 

 showing several gametangia. x 26. Figs. 3-6, portions of 

 four filaments, each showing a spherical gametangium 

 with a small basal cell or septum, x 70. I. Espafiola. 



Figs. 7-8. Spongomorpha conjuncta. Fig. 7, a small portion of the 

 central strand system to shoAv the binding rhizoidal fila- 

 ments. X 16. Fig. 8, tip portion of a branch to show the 

 blunt unilateral branchlets. x 60. I. Santa Maria. 



Figs. 9-11. Zosterocarpus abyssicolus. Fig. 9, portion of a branch to 

 show the branchlets, the young "sporangial" cells, and 

 beginning gametangium development. Fig. 10, the tip 

 portion of a branch to shoAv the acute apex, the inter- 

 calary growth zones, and one of the yellow "sporangial" 

 cells. Fig. 11, forks of two larger branches to show the 

 character of the junction, and a well-developed game- 

 tangial zone, x 245. I. Santa Maria. 



Figs. 12-17. Sporochnus rostratus. Six paraphysal branches from a 

 fertile ramulus, to show the expanded end cell, young 

 and old sporangia, and empty sporangial walls, x 330. 

 I. Santa Maria. 



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