X LIST OF ILLUSTRATIONS. 



FACE. 



KEGASPORE OF ISOETES FOVEOLATA . 241 



MEGASPORE OF ISOETES GRAVESII ■ ^43 



MEGASPORE OF ISOETES MELANOSPORA • 244 



MEGASPORE OF ISOETES FLACCIDA ^44 



MEGASPORE OF ISOETES HOWELLI ' =46 



MEGASPORE OF ISOETES MELANOPODA =5i 



MEGASPORE OF ISOETES BUTLERI =52 



MEGASPORE OF ISOETES NUTTALLII . =53 



MEGASPORE OF ISOETES ORCUTTI =53 



MEGASPORE OF ISOETES MINIMA =54 



