Fig. 76. — A, Piper medium, showing extensive development of endosperm before first, 

 division of fertilized egg; x 175; fi-D*I%peromia pellucida: i?, longitudinal section 

 of ripe seed, showing the small embryo, scanty endosperm, and abundant perisperm ; 

 x 55; (.' terminal portion of a similar section at an early stage of germination; 

 x 175; />, longitudinal section of a germinating seed, showing tlie endosperm pro- 

 truding with the embryo; x 55: a, nntipodals ; c, cotyledons; cp, earpellary tissue; 

 «, endosperm ; em, embryo; i, integument ; e>, oosphere ; p, perisperm ; r, rhizoid ; s, 

 synergid ; st, stigma; 0, tapetal cells. — After Johnson. 65 

 168 



