CHAPTER XXI
=FOSSIL FERNS.= Pp. 324–394.
=Osmundaceae= 324–346; =Schizaeaceae= 346–351; =Gleicheniaceae= 351–355; =Matonineae= 355–363; =Hymenophyllaceae= 363–365; =Cyatheaceae= 365–375; =Polypodiaceae= 375–380; =Dipteridinae= 380–394.
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=FOSSIL FERNS.= Pp. 324–394.
=Osmundaceae= 324–346; =Schizaeaceae= 346–351; =Gleicheniaceae= 351–355; =Matonineae= 355–363; =Hymenophyllaceae= 363–365; =Cyatheaceae= 365–375; =Polypodiaceae= 375–380; =Dipteridinae= 380–394.
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