Fig. 9: 1, Marsilea tenuifolia: 1, plant, x %. 2, Marsilea macropoda: 2, plant, x %. 

 3, Marsilea uncinata: 3, plant, x %. 4, Marsilea mucronata: 4, plant, X %. 5, Ophio- 

 glossum nudicaule var. tenerum: 5, plant, x 1. 6, Ophio^lossum petiolatum: 6, plant, 

 X 1. 7, Ophiof^lossum crotalopliornides: 7, plant, x 1. 8 and 9, Ophioglossum vulf^atum: 

 8, plant, X %; 9, tip of leaf, slightly enlarged. (From Correll in Lundell's Flora of 

 Texas. Vol. 1, PI. 8). 



