Common name: Western sword fern
Polystichum munitum is an evergreen fern native to western North America and is an important understory plant in temperate rainforests. It is widely planted throughout the Garden. The fronds were used by the Coast Salish as a traditional pain reliever, and the roasted rhizomes were a food source. Botanic name etymology.
Fern photo by Jami Dwyer - Wikimedia
Frond back with spores by Kurt Stüber - Wikimedia
Emerging frond by Bureau of Land Management Oregon and Washington -Public Domain,