SPERMATOPHYTES 



233 



h 



f 



FIG. 529. Archegonia of Ephedra, showing 

 their elongated form and massive necks. After 

 LAND. 



FIG. 528. Diagrammatic section of ovule of Ephedra, showing outer integument 

 (pi), inner integument (if) forming the long micropylar tube, the remarkable pollen- 

 chamber (pc), and the elongated female gametophyte (within the embryo sac) with 

 two long-necked archegonia. After LAND. 



