162 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL.3 



PLATE 21 



Fig. 21. Rhoiiyniffiia Skotlshrrt/ii, detail of the region of growth 

 showing the sympodial method of branching, x 2^/2 



Fig. 22. The same enlarged, x 8 



Fig. 23. R. Skottsbercjii, detail of the amplexicaul structure of 

 the branches as derived from the development shown in 

 figs. 21-22. X 5 



Figs. 24-25. R. flabellifolia, apices of a specimen from the Gala- 

 pagos Islands, showing sympodial growth analogous 

 with figs. 21-22. X 10 



Figs. 26-27. R. flaJ>etlifolia, apices of a specimen from Chile, x 10 



Fig. 28. R. coralliiia, svmpodial apex, x 8 



