THEORETICAL CONCLUSIONS 



423 



Fig. 215. Occurrence of pollen grains in stylar canal and ovary of Butomopsis 

 lanceolata. A, l.s. carpel, showing a row of five pollen grains in the stylar canal. 

 B, upper part of same, enlarged to show structure of pollen grains. C, upper 

 part of carpel, showing eight pollen grains in stylar canal and one near stigma. D, 

 one pollen grain near upper end of stylar canal. E, upper end of carpel, showing 

 stylar canal with irregularly cut pollen tubes and two pollen grains. F, l.s. carpel 

 showing pollen grain germinating directly on an ovule. G, pollen grain and part 

 of ovule of F, enlarged to show nuclear details. (After Johri, 1936.) 



