PLATE 38 



Fig. 1. Teratological tissue in F, hybrid Crepis capiUaris X tectorum. Z 5. 

 Cross-section of root just below ground level. X 530. 



a. A vegetative cell dividing (metaphase). This cell is completely sur- 

 rounded by fully differentiated cells. 



b. Very much crumpled and distorted cells of outer wall of seedling. 



c. Black areas showing decomposition of cells. 



Fig. 2. Chromosomes of Crepis capillaris. Polar view showing two J's and 

 four more or less rodlike. X 1500. 



Fig. 3. Chromosomes of Fj hybrid C. capillaris X C. tectorum (Z 5) show- 

 ing two J 's, one V, and rodlike ones. X 1500. 



[204] 



