^ " 



*f« .1 V ♦*, i^«» 







• I ♦^ . * 







.,f 







« ■ 1* 



'^' 







Fig. 227. Meiosis in three hybrid horsetails in permanent acetocarmine mounts, x 1000. a. Equisetum 

 litorale Kuhlw. first meiotic metaphase showing pairs and univalents, b. E. Moorei Newm. the 

 same showing pairs, univalents and multivalents, c. E. trachyodon A.Br, diakinesis showdng complete 

 failure of pairing, d. The same at anaphase of the first meiotic division showing one pair on the 

 equator and the remaining unpaired chromosomes distributing themselves at random to the poles. 



229 



