GNETALES 



377 



Fig. 423. — Ephedra trifurca: longitudinal section 

 of ovule, showing nucellus with deep pollen chamber 

 {p), inner (/) and outer (0) integuments, and female 

 gametophyte with reproductiv^e, storage (5), and 

 haustorial Qi) regions; X48. — After Land (i8). 



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