iqiq] stout— intersexes 121 



of the same flower. Here, however, the anthers are all quite 

 uniform in size and shape. A rather large portion of the apex is 

 sterile, but the anther sacs dehisce fully, and about 50 per cent 

 of the pollen which they contain appears to be normal. In tests, 

 however, only grains of large size germinated, and the tubes 

 from these made only a feeble growth. 



No. 39 (figs. 39, 40). — Filaments are here not only of unequal 

 length, but all are more or less twisted, and nearly all are ex- 

 panded broadly at the base of the anthers. The upper portions of 

 the anthers are leaflike. Anther sacs vary in number and in degree 

 of development; all 4 may be in evidence, or there may be only 

 2 (fig. 40), but all are more or less rudimentary and none dehisce. 

 Nearly 30 per cent of the microspores examined were granular 

 and of large size. Of 3 cultures, only 2 grains germinated, and the 

 best tube obtained was 0.35 mm. in length. 



No. 41 (figs. 41-43). — In the stamens of this plant the anthers 

 are reduced to irregularly sagittate-shaped leafy structures. Such 

 structures are often composed only of sterile tissue; in some a 

 mere nest of spores develops, but these spores are completely 

 imbedded in sterile tissue. In no case was more than one such 

 nest found in a stamen. Dissection of fully mature structures 

 revealed that the microspores were represented by shriveled cells 



(fig- 43)- 



No. 44 (figs. 44, 45). — In this plant the stamens are some- 

 what more leaflike than those just described. Some are completely 

 sterile, and usually one nest, but sometimes two, of sporogenous 

 tissue may be present in a stamen. Only a few pollen grains 

 appear normal when dissected out. 



No. 46 (figs. 46, 47, 48, 56). — A wide range of variation is 

 seen among the stamens produced by this plant. All stamens 

 in a flower may be completely sterile and foliose, as in fig. 46, 

 all .may have quite well developed anthers with much good pollen, 

 or all grades between these extremes may be present; 4 stamens 

 from a single flower are shown in fig. 48, and illustrate very well 

 this range. Flowers growing side by side and opening at the 

 same date exhibit wide variations and a great mixture of types. 

 In several plants under observation this was the condition in all 



