26 Brown: APOGAMY IN PHEGOPTERIS POLYPODIOIDES 
irregular-shaped old prothallium whose basal portion had died. 
The apex of this prothallium was strongly indented, the sinus 
being situated slightly to one side of the middle. From one 
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side of the prothallium a very much branched proliferation 
developed, while from the cellular mass outgrowths resembling 
somewhat the normal leaves of young sporophytes were formed. 
