

Fig. 167. Cyrtomium falcatum (L.f.) Presl, the abnormal mitosis in the eight-celled archesporium. In each 

 case only four cells are visible. From sections stained with haematoxylin and Bismark brown, x 1000. 

 a. The premeiotic metaphase still normal, b. The premeiotic 'anaphase' with the chromosome still 

 on the equatorial plate, c. The premeiotic telophase. Restitution nuclei have been formed in each 

 cell without cytoplasmic division, d. The beginning of meiosis. Eight (four visible) giant mother 

 cells each with twice the previous number of chromosomes. Note signs of cytoplasmic cleavaere in 

 one of them. 



