JQ.20] 



CHAMBERLA IN—BOTRYCHIUM 



393 



from 



ordinary 



would be tested by sowing the spores and growing the plants; but, 

 so far as we are aware, no one has ever succeeded in raising prothallia 

 of any species of Botrychium from the spore. Even if someone 



should find out how to ffrow nrot.ha.Hia. and snnrpl in as ir wnnlH 





Figs. 3-5, 



unusua 



llygood sporangia: small plant of B. obliquum. 



typi- 



take a long time to secure any results. How long the spore may 

 rest before germinating is problematical; but even after it ger- 

 minates it is probably a year or more before the prothallium reaches 

 the fertilization stage. In adult plants the leaf is in its fourth year 

 when it appears above ground. Consequently at least five years, 

 and more probably six or eight years, would elapse between the 



