IQISI 



BARTLETT—MASS MUTATION 



433 



number to be 28. For a figure showing the mature stem of f. 

 typica the former article on 0. pratincola in this journal should be 

 consulted. 



Fig, I. — Progeny of Lexington E-s, pan 5 (part of culture 2; see table II); the 

 pan contained 23 rosettes whicii were classified, most of them at maturity, as follows; 



