PLATE 16. 



Shows meiosis in the following : 



(a) " D. dilatata " (Scotland). 1st diakinesis. n = 41 pairs (X 1,000). 



(b) " D. dilatata " (Madeira). 1st diakinesis. n = 41 pairs (X 1,000). 



(c) Hybrid D. dilatata (4n) X " D. dilatata " (2n, Scotland). 1st diakinesis, early, n ^- 39 pairs + 45 

 singles (X 1,000). See explanatory Fig. 7. 



(d) Hybrid D. dilatata (fn)X " D. dilatata" {2n, Madeira). 1st diakinesis. n 1 quadrivalent + 

 1 trivalent + 34 pairs -| IS sini>lcs (X l.OOO). See explanatory iMg. S. 



(e) Hybrid " D. dilatata " (2n, Scotland) X D- spinidosa. 1st diakinesis, early, n = 38 pairs + 47 singles 

 (X 1,000). See explanatory Fig. 9. 



(f) Hybrid " D. dilatata" (2n, Madeira) X D. spinulosa. h;t diakinesis. n = 35 pairs 4- 53 singles 



