▁lack ing ▁well - defined ▁sp ines ▁or ▁leaves , ▁showing ▁a ▁variety ▁of ▁branch ing ▁patterns ▁that ▁may ▁be ▁is ot om ous , ▁an is ot om ous , ▁pseud omon op od ial ▁or ▁advent it ious . ▁El ong ate ▁to ▁glo bose ▁sp or ang ia ▁were ▁terminal ▁on ▁main ▁axes ▁or ▁on ▁later al ▁systems ▁showing ▁limited ▁branch ing . ▁It ▁seems ▁probable ▁that ▁the ▁x yle m , ▁compr ising ▁a ▁solid ▁str and ▁of ▁tra che ids , ▁was ▁cent r arch ." ▁However , ▁Edwards ▁and ▁Edwards ▁also ▁decided ▁to ▁include ▁rh yn i oph y to ids , ▁plants ▁which ▁" look ▁like ▁rh yn i oph y tes , ▁but ▁cannot ▁be ▁assigned ▁une qu iv oc ally ▁to ▁that ▁group ▁because ▁of ▁in ade qu ate ▁an atom ical ▁pres ervation ", ▁but ▁exclude ▁plants ▁like ▁Ag la oph y ton ▁and ▁Hor ne oph y ton ▁which ▁definitely ▁do ▁not ▁possess ▁tra che ids . ▁ ▁In ▁ 1 9 6 6 , ▁slightly ▁before ▁B anks ▁created ▁the ▁sub div ision , ▁the ▁group ▁was ▁treated ▁as ▁a ▁division ▁under ▁the ▁name ▁Rh yn i oph y ta . ▁Taylor ▁et ▁al . ▁in ▁their ▁book ▁Pale ob ot any ▁use ▁Rh yn i oph y ta ▁as ▁a ▁formal ▁tax on , ▁but ▁with ▁a ▁loose ▁definition : ▁plants ▁" character ized ▁by ▁dich ot om ously ▁branch ed , ▁n aked ▁aer ial ▁axes ▁with ▁terminal ▁sp