Dryopteris intermedia is a fern from a short, scaly ascending to erect rhizome, roots sparingly colonized by VA mycorrhizas (Brundrett and Kendrick 1988).
Leaves in a rosette, to 80 cm long, evergreen; stalk 10-30 cm, scales broad, pale brown with darker markings; blade to 50 cm long, 20 cm wide, tip long-tapered, base blunt, widest just above base, twice pinnate-pinnately lobed to three times pinnate, lowest leaflet with its lowest secondary leaflet shorter than the next above it; secondary leaflets deeply lobed and toothed, teeth bristle-tipped (spinulose).
Spore cases midway between midrib and margin of ultimate divisions.
Wetland status: FACU.
Frequency in NYC: Infrequent.
Origin: Native to NYC.
Habitat: Moist, rich woods. Often growing on decayed wood (Brundrett and Kendrick 1988).
Notes: New leaves emerging in spring as tree canopy closes, replacing over-wintered leaves.