Brown: APOGAMY IN PHEGOPTERIS POLYPODIOIDES 33 
kept in the laboratory. The percentage of male prothallia 
was much higher in cultures on the modified solutions, while 
on the unmodified solutions female prothallia predominated. 
4. Both monecious and dioecious prothallia occurred in all 
the cultures, but the percentage of monoecious prothallia was 
low, even in young cultures on the modified solutions. 
5. Apogamous sporophytes were observed in cultures on 
Prantl’s solution with NH,NO; omitted. 
6. Apogamous outgrowths and structures intermediate be- 
tween mere outgrowths and apogamous sporophytes were 
observed in cultures on the Knop’s full nutrient solution. 
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