Gates, Tetraploicl Mutants and Chromosome Mechanisms. 



123 



less crinkled, being often nearly smooth (cf. fig. 4). 3) The margin 

 of the stem leaves is much more conspicuously repand-dentate, 

 often with jagged teeth near the base (see fig. 5). 4) In habit 

 (cf. figs. 2 and 4), having the basal branches more spreading, and 

 more numerous and longer stem-branches, which developed secondary 



Fig. 5. Upper row, three stem leaves from 0. gigas, Sweden. 

 Lower row, three stem leaves from 0. gigas, Italy. 



branches later in the season. The plants were thus distinctly larger 

 and more bushy than 0. gigas, Italy. 5) The flowers were decidedly 

 larger, as shown in Table I. Long hairs on the bud cone were 

 also more numerous and from larger papillae, the hairs themselves 

 being also longer. 6) An interesting constant difference was found 

 in the capsules 23 ), which in gigas Italy were contracted at the 

 extreme base, as in most of the related forms, while in gigas 

 Sweden, they were usually expanded vertically to give a broad 

 base of attachment reaching as much as 14.5 mm in one dimension. 

 The capsules are also longer 24 ) than in the former, which is doubt- 



23) Nils son (1912), in his recent paper gives (p. 133) a fuller account of 

 the contrasting characters between these two giant types, but apparently has not 

 observed this difference in the fruits. 



24) The fact that this race is decidedly larger in stature, including size of 

 stems, leaves, flowers, ovaries and capsules, may not be without significance. I 



