384 



STRUCTURE AND LIFE HISTORIES 



i; i 



Fig. 279. — Selaginella Walsoniana. Base of foliage leaf, showing ligule, 

 L. Enlarged about 36 times. 



Fig. 280. — Selaginella Sp. Photomicrograph of a longitudinal section 

 through the tip of a cone, showing sporangia {sp), and ligules {lig.y 

 (Cf. Fig. 268.) 



