67 
Stomata and Hydathodes in Campanula rotundifolia L. 
Fig. 4. Stomata per sq. mm. on Fig. 5. Stomata per sq. mm. on Fig. 6. Hydathode pores per 
upper surfaces according to posi- under surfaces according to posi- sq. mm. on upper surfaces ac¬ 
tion of leaf. tion of leaf. cording to position of leaf. 
