

[Vol. 9, 1922] 



222 ANNALS OF THE MISSOURI BOTANICAL GARDEN 



Explanation of Plate 



PLATE 14 



Fig. 9. Isoetcs velata var. Perralderiana Pfeiffer. Megaspores. 



Fig. 10. 7. velata A. Br. Megaspores. 



Fig. 11. I. tegulensis (Jenn. Mega spores. 



Pig. 12. I. alpina Kirk. Megaspores. 



Pig. 13. I. Kirhii A. Br. Megaspores. 



