Gymnocarpium dryopteris, the Oak Fern or Western Oak Fern, is a delicate, deciduous fern native to the Northern Hemisphere. It has a long-creeping rhizome and produces triangular, tripinnate fronds that are held horizontally in a single plane, forming a beautiful, low, lacy carpet. The fronds are a fresh, pale green. The sori are naked (no indusium), round, along the veins. It is a classic "carpet" fern for woodlands.
| Family: | Dryopteridaceae |
| Genus: | Gymnocarpium (jim-no-KAR-pee-um) |
| Species: | dryopteris (dry-OP-ter-iss) |
| Synonym: | Dryopteris disjuncta |
| Synonym: | Carpogymnia dryopteris |
| Synonym: | Currania dryopteris |
| Synonym: | Thelypteris dryopteris |
| Synonym: | Dryopteris linnaeana |
Oak Fern thrives in cool, moist, humus-rich, acidic soil in deep shade. It spreads slowly to form a stunning, weed-suppressing groundcover in woodland gardens. It is intolerant of heat, drought, and alkaline soils. It is perfect under trees and shrubs, in fern borders, and naturalized in cool climate woods. A refined, essential plant for the shade garden.
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