— 68 - 



Fig. 57 & 58. Protonema of Funaria grown in dark; eight days on pep- 



tone ; sugar and agar-agar. x 330. 

 „ 59. Prothallium of Cerathopteris thalyctrioides grown in the dark 



at 32° C. In culture 16 days. x 330. 

 „ 60. Apical portion of a prothallium of the same species showing 



longitudinal a well as transverse divisjons. x 330. 

 „ 61. Germinating spore of the same age as in 59, only grown in 



light at a temperature of 19°— 21° C. x 330. 



