218 



[Vol. 9, 1922] 



ANNALS OF THE MISSOURI BOTANICAL GARDEN 









Explanation of Plate 





In this and the following plates, which are reproductions of photographs, 

 the magnification is approximately 21 diameters in all cases of megaspores. 



Fig. 



Fig. 



Fig. 



Fig. 



PLATE 12 



Fig. 1. 



Isoctes Schweinfurthii A. Br. Megaspores. 

 la. I. ovata Pfeiffer. Megaspores. 



2. 2. ooromandelina L. fil. Megaspores. 



3. 1. 8< facta Bosc. Megaspores. 



4. J. Malinvemiana Cesat. & De Not. Megaspores. 



