Abstract
The list of Pteridophyta found in Indiana was compiled from the "Flora of Indiana," by Charles C. Deam and the yearly supplementary distribution records prepared by the State Flora Committee of the Indiana Academy of Science. The publications give the state distribution by counties. For data concerning the national distribution and various state floras, manuals of wider scope and periodical literature were used. The national distribution of the Indiana ferns and fern allies was mapped as accurately as possible, and from these maps the determination of intraneous and extraneous species was made.
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