Cedar Creek is represented by only common species of the Polypodiaceae. Athyrium angustum (Lady Fern) is a common understory plant of white cedar swamp. Pteridium aquilinum (Bracken Fern) is a common species of upland woods. Onoclea sensibilis (Sensitive Fern) is common along the rim of many marshes and old field depressions. Adiantum pedatum (Maiden Hair Fern) is an uncommon species found in lowland woods to the east of Crone’s Knoll. Matteuccia struthiopteris (Ostrich Fern) is planted behind the Duck Barn.
Gymnocarpium dryopteris (Oak Fern) is a short-statured fern found in lowland woods bordering white cedar swamp.The remaining ferns in this family are small species of marshes. They include: Dryopteris carthusiana, D. cristata, and Thelypteris palustris. The last mentioned is the most commonly encountered species in marshes.