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Fig. 53. Acetocarmine preparations of the British species of Drjo/jfem sens. stiict. x 1000. a. D.aemula 

 (Ait.) O. Kuntze. n = \\. For explanatoiy diagram see Fig. 51. h. D. Villarsii (BeW.) Woynar from 

 Britain. n = 82. c. D. spinulosa (Mull.) Watt, somatic metaphase in a tapetal cell. 2n= 164. For 

 explanatoi-y diagram see Fig. 55. d. D. cristata {L.) A. Gray from Surrey. n = 82. For explanatory 

 diagram see Fig. 56. e. Diploid D. dilatata from Switzerland. For explanation see text. n = ^i. 

 J. Normal British form of D. dilatata (Hoffm.) A. Gray. w = 82. 



