ANGIOSPERMS 



225 



that the anther comes to contain only two spore cham- 

 bers (Fig. 212). These two spore chambers are plainly 



FIG. 212 Cross-section of a mature anther of a lily, much larger than that shown 

 in Fig. 211, showing the two chambers formed by the four sporangia, and also 

 the region of opening (). 



FIG. 213. Anthers opening by terminal pores: A, Solanum; B, Arbutus; C 

 Vaccinium. A and B, after ENGLER and PRANTL; C, after KERNER 



