4 



Fig. 259. Chromosomes o[ Selaginella. a. S. spimdosa A.Br, diakinesis in fresh acetocarmine. x 1000. 

 For explanatory diagram see Fig. 260a. n = 9. b. The same, metaphase of the second meiotic 

 division, permanent acetocarmine. x 1500. For explanatory diagram see Fig. 2606. c. The same, 

 mitosis in a root, x 1500. For explanatory diagram see Fig. 260c. 2«= 18. d. S. denticulata 

 (L.) Link. Part of a section through a megasporangium with the single spore mother cell which 

 it contains at metaphase of the first meiotic division. The diminutive plate of tiny chromosomes 

 lies in the plane of the arrow, x 1000. e. S. helvetica (L.) Link. Mitosis in a root, x 1500. For 

 explanatory diagram see Fig. 260^. x 1500. 2n= 18. 





Selaginella spinulosa n=9 

 Fig. 260. Explanatory diagram to Fig. 259 a, b, c, e. All x 2000. 



260 



