326 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 12 



PLATE 5 



Fig. 1. Gelidium pusilhtm v. cylindncum. A small portion of 

 a clump, mostly in the tetrasporangial state. I'he fertile 

 portions appear slightly more swollen in the reproduc- 

 tion than in the fresh state, x 4.4. Ecuador. 



Figs. 2-6. Gelidium galapaijcnsc. Fig. 2, a portion of a clump 

 showing the rhizomatous portion and the erect branches 

 with much-divided blades, which show tetrasporangial 

 sori in the lobes. Fig. 3, a branch system with less- 

 divided blades and larger sori. Figs. 4-6, a branch 

 system of various degrees of simplicity, x 3.3. I. Isabela. 



Fig. 7. Gelidium pusillum v. pacificum. A small portion of a 

 tuft showing the basal and upper branches, the latter 

 pinnately divided. The tetrasporangial sori appear in the 

 tips of three branches, and the tip of one is indented 

 owing to the disintegration of a matured sorus. x 3.0. I. 

 Santa Maria. 



Figs. 8-12. Gelidium isahelae. Portions of several branch systems to 

 show the rhizomatous portions and the erect simple or 

 subsimple blades. In fig. 12 one blade shows a tetra- 

 sporangial sorus. x 4.8. I. Isabela. 



Fig. 13. Gelidium sclerophyllum. A portion of an unusually regu- 

 larly pinnate axis, showing the lateral tetrasporangial 

 branchlets with the sori in the tips surrounded by 

 thickened sterile margins. One tip is perforated by the 

 disintegration of a matured sorus. x 8.0. Ecuador. 



