[Vol. 9, 1922] 

 224 ANNALS OF THE MISSOURI BOTANICAL GARDEN 



EXPLANATION OF PLATE 



PLATE 15 



Fig. 14. Isoetes Gunnii A. Br. Megaspores. 



Fig. 15. I. Drummondii A. Br. Megaspores. 



Fig. 16. I. histrix Bory & Dur. Megaspores. 



Fig. 17. I. Nuttallii A. Br. Megaspores. 



Fig. 18. 7. Orcuttii Eaton. Megaspores. 



