[Vol. 9, 1922] 

 218 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. 



PLATE 12 



Fig. 1. Isoetes Schweinfurthii A. Br. Megaspores. 



Fig. la. /. ovata Pf eiffer. Megaspores. 



Fig. 2. I. coromandelina L. f il. Megaspores. 



Fig. 3. I. setacea Bosc. Megaspores. 



Fig. 4. I. Malinverniana Cesat. & De Not. Megaspores. 



