-1* 









?«»* 



£. hiemale n -- /08 



Fig. 216. Explanatory diagram to Fig. 215a. x 1500. 



1 



f«JI--lllt, 



Fig 217 Comparison of chromosome size at diakinesis in a large and a small chromosomed species of 

 horsetail, from sections, x 1000. a. E. arvense L. (see further Fig. 218). b. Equisetum robustum 

 A.Br. (cf. Fig. 213a). 



