^ 





J 



-44* * V. 



V, 



I 





Fig. 239. Cytology of the Dublin specimen of Tmesipteris tannensis (Spreng.) Bernh. Permanent aceto- 

 carmine. x 1000. a. Mitotic metaphase in a tapetal cell with 2?j = over 400. i. Meiosis in the 



same with n = over 200. 



242 



