STRUCTURE AND LIFE HISTORIES 
FIG. 279. Selaginetta Watsoniana. Base of foliage leaf, showing ligule, 
L. Enlarged about 36 times. 
FIG. 280. Selaginetta sp. Photomicrograph of a longitudinal section 
through the tip of a cone, showing sporangia' (sp), and ligules (tig.). 
(Cf. Fig. 268.) 
