No. 52. CHARACTERISTIC POLLEN GRAINS OF WILD AND 

 CULTIVATED SPECIES OF GOSSYPIUM. 



1. G. drynarioides x 450 times life size ; 2. G. Sturtii x 450 ; 3. G. Darwinii x 450 ; 

 4. G. Stocksii x 450 ; 5. G. hirsutum x mexicanum (Molango) x 450 ; 6. G. hirsutum x mexicanum 

 (Molango), second spore x 450; 7. G. arboreum X 300; 8. G. obtusifolium x 300; 9. G. obtusifo- 

 lium, var. africana (obtusifolium, spore x 300) ; 10. Second (arboreum, spore x 300). 



