[Vol. 9, 1922] 

 220 ANNALS OF THE MISSOURI BOTANICAL GARDEN 



EXPLANATION OF PLATE 



PLATE 13 



Fig. 5. Isoetes cubana Engelm. Megaspores. 



Fig. 6. I. adspersa A. Br. Megaspores. 



Fig. 7. /. Boryana Dur. Megaspores. 



Fig. 8. I. tenuissima Boreau. Megaspores. 



