lo id ▁back cross ▁of ▁A .   ×   eben o ides ▁with ▁A .   rh iz oph yll um ▁was ▁accident ally ▁generated ▁in ▁culture ▁in ▁ 1 9 5 6 , ▁and ▁subsequently ▁identified ▁with ▁a ▁f ern ▁collected ▁in ▁West ▁Virginia ▁in ▁ 1 9 4 6 , ▁previously ▁identified ▁as ▁an ▁aber rant ▁A .   ×   eben o ides . ▁This ▁hy brid ▁is ▁intermediate ▁between ▁its ▁parents , ▁bearing ▁lo bes ▁in ▁the ▁bas al ▁part ▁of ▁the ▁fr ond ▁only , ▁and ▁with ▁pur ple ▁color ▁extending ▁up ▁the ▁ra ch is ▁but ▁not ▁the ▁st ipe . ▁A .   ×   c ru ci bul i , ▁an ▁artificial ▁hy brid ▁between ▁A .   pl aty neur on ▁and ▁the ▁Asian ▁walking ▁f ern , ▁A .   ru pre ch ti i , ▁has ▁nar ro wer ▁bl ades , ▁deeply ▁p inn atif id ▁in ▁the ▁middle ▁and ▁becoming ▁p inn ate ▁at ▁the ▁base . ▁ ▁Tax onomy ▁ ▁Disc overy ▁The ▁first ▁known ▁collection ▁of ▁the ▁f ern ▁was ▁made ▁in ▁ 1 8 6 0 , ▁by ▁a ▁Mrs . ▁Adams , ▁near ▁Lanc aster , ▁Pennsylvania . ▁R . ▁Robinson ▁Scott ▁was ▁the ▁first ▁to ▁identify ▁the ▁f ern ▁as ▁a ▁new ▁species , ▁based ▁on ▁spec im ens ▁collected ▁in ▁ 1 8 6 1 , ▁on ▁the ▁west ▁bank ▁of ▁the ▁Sch u yl kill ▁River ▁about ▁ ▁above ▁Philadelphia . ▁The