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Plate I.
1. Adder's Tongue. Ophioglossum vulgatum. 1 to 2 in.
2. Moonwort. Botrychium simplex. 2 to 5 in.
3. Moonwort. Botrychium matricaria. 3 to 6 in.
4. Common Rock Fern. Polypodium vulgare. 6 to 10 in.; evergreen; fruit dots large and round.
5. Woodwardia angustifolia. 1 ft. high; fertile plants, with narrow curled-up leaflets, and fruit dots parallel to midrib.
6. Mountain Fern. Phegopteris polypodioides. 12 in.; narrow triangular, hairy; fruit dots small.
7. Phegopteris hexagonoptera. 12 to 15 in.; broad triangular, smooth.
8. Sensitive Fern, Wood Swamp Fern. Onoclea sensibilis. 2 to 4 ft.
