GNETALES 



377 



Fig. 423. — Ephedra trifurca: longitudinal section 

 of ovule, showing nucellus with deep poUen chamber 

 (/>), inner (i) and outer (0) integuments, and female 

 gametophyte with reproductive, storage (j), and 

 haustorial {h) regions; X48. — After Land (18). 



