Fig. 104. Ceterach officinarum Lam. & DC. a fresh frond of a 

 British specimen. Natural size. 



Fig. 105. Meiosis in Ceterach officinarum Lam. & DC, 

 permanent acetocarmine. x 1000. 





^* 







Ceterach n -- 72 



Fig. 106. Explanatory' diagram to Fig. 105. x 1500. 



Fig. 103. Living leaves of the 

 two forms of Asplenium Tri- 

 chomanes. 



a. Tetraploid, cf. Fig. loia. 



b. Diploid, cf. Fig. loi ^. Kew 

 reference no. 157.46. 



