PLATE 13 



Figures 10-15 show normal meiosis in the pollen mother cells, and Figs. 16-20 show highly irregular meiosis 

 in the pollen mother cells of some hybrid sedges, with univalents marked by arrows, and a few multivalents 

 forming chains and rings of chromosomes. All photographs X 2,400. 



16 17 18 



Fig. 



10. 



Fig. 



11. 



Fig. 



12. 



Fig. 



13. 



Fig. 



14. 



Fig. 



15. 



Fig. 



16. 



Fig. 



17. 



Fig. 



18. 



Fig. 



19. 



Fig. 



20. 



19 20 



Carex serotina var. cyperoides, Shapwick peat moor, Somerset, n 35. 



C. scandinavica, Loch Torridon, W. Ross, n = 35. 



C. scandinavica, Sweden, n = 35. 



C. mairii, Lumbreras, Spain, n = 34. 



C. extensa, Rhos Neigr, Anglesey, n = 30. 



C. distans, St. Nectaire, Central France, n = 37. 



C. demissa X C. hostiana, Loch Tummel, Perthshire. 



C. lepidocarpa X C. demissa, Teesdale, Durham. 



C. lepidocarpa X C. demissa, Hokatorp, Sweden. 



C. demissa X C. serotina var. cyperoides, Shapwick, Somerset. 



C. demissa, Shapwick, Somerset, X C. /epidoairpci, Teesdale, Durham; hybridised 10 May, 1951. 



