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Intraneous Species
The Intraneous species comprises 49 taxonomic entities. Flora belonging to this group is found within Indiana and all other nearby locations around the region. Typically found throughout the state, common examples include Adiantum pedatum (maidenhair fern), Botrychium dissectum var. oblique (cut-leaved or dissected fern) and Botrychium virginianum (rattlesnake fern); Dryopteris noveboracensis (New York fern); Equisetum arvense and Equisetum prealtum (field or common horsetail); and Polystichum acrostichoides (christmas fern).
Extraneous Species
There are 31 Pteridophyte species found in Indiana. Although found within the region, species within this group cannot be found in surrounding areas. Fifteen of these are found in the unglaciated hills and lowlands of the state, while the lakes area is host to a similar number. The IIlinoian and Tipton hill plains have 10 and nine, respectively. Examples of extraneous species include Isoetes engelmannii (Appalachian or Engelmann̵7;s quillwort), Lycopodium selago var. patens (clubmoss) and Pellaea glabella (smooth cliffbrake).
Disjunct Species
Species in this group are typically found outside their continuous range in detached colonies. Common examples of this species belonging to either eastern or northeastern distributions include Lycopodium obscurum (rare clubmoss), L. tristachyum (deeproot clubmoss) and Woodwardia virginica (Virginia chainfern).
Endemic Species
This group has species found only in specific regions and nowhere else. There are two predominantly western ferns -- Equisetum laevigatum and E. kansanum (field or common horsetail). Botrychium simplex (little grapefern), Dryopteris boottii (Boott̵7;s woodfern) and Equisetum fluviatile (horsetail) are predominantly northern. The southern group includes Cheilanthes lanosa (hairy lip fern) and Polypodium polypodiodes var. michauxianum (resurrection fern).