64 HETEEOSTYLED DIMOEPHIC PLANTS. Chap. L 



of tlie same flower, and as I could not detect in the 

 dried specimens of the two forms any difference in their 

 etigmas, or in the size of their pollen-grains, I dare not 

 rank this plant as heterostyled. From statements made 

 by Vaucher I was led to think that Soldanella alpina was 

 heterostyled, but it is impossible that Kerner, who has 

 closely studied this plant, could have overlooked the 

 fact. So again from other statements it appeared prob- 

 able that Pyrola might be heterostyled, but H. Muller 

 examined for me two species in North Germany, and 

 found this not to be the case. 



