Athyrium yokoscense

Epithet means "from Yokohama."

Deciduous, 1V2 to 2V2 ft. (45 to 75 cm).Zones 4 (an estimate) to 8.

description: The rhizome is erect. The ruddy, straw-colored stipes of up to one-half of the frond length are swollen at the base and produce two-toned scales with dark centers and tan edges. Broadly lanceolate blades are bipinnate with 12 to 20 pairs of pinnae. Sori and indusia of 4 to 10 per pinna are medial and elliptic to hooked.

range and habitat: This species is native to the deciduous woods of Siberia, Manchuria, Sakhalin, Japan, the Kuriles, Korea, and China. It grows in acidic soils and is reputed to tolerate wet and heavy loam (verging on clay) and bogs.

culture and comments: The fronds are a subtle blend of metallic pewter overlaid with a soft rosy green patina. My plants, from Korean material imported by Richard Lighty, have been basking in light shade for many years in traditional moist compost. i have not tried them in mud. Environmentally, this fern is currently being tested in Japan for phytoremediation purposes to remove cadmium from contaminated soils.

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