100 



L *.'-.' 



Gates, Tetraploid Mutants and Chromosome Mechanisms. 



individuals to be mentioned later. Fig. 3 21 ) shows a typical mature 

 rosette photographed July 10 th . 



Until the end of June the rosettes were indistinguishable 

 from culture 227 / ]2 - Then the rosettes were found to be larger and 

 with more jagged teeth at the base of the blade in the older leaves. 



Fig. 4. 0- gigas Sweden, cult. 23 



112' 



When fully developed, as in fig. 4 22 ), they were found to differ 

 constantly from culture " 7 /', 2 in the following characters. 1) The stem 

 leaves have conspicuous red midribs, and the midribs and petioles were 

 also pink on their ventral surface. 2) The stem leaves are longer and 



21) Cf. Nilssou (1912, textfig. 30, p. 178). 



22) Cf. Nilsson (1912, textfig. 27, right, p. 165). 



