Mackay's Fragile Fern (Cystopteris Tenuis) is a perennial fern in the Woodsiaceae family with moderate care difficulty. It requires moderate watering and partial shade or full shade or dappled_shade light in USDA hardiness zones 3-8. This plant is safe for cats and dogs.

A delicate fern species known as Mackay's fragile fern, a hybrid likely descended from Southern fragile fern and an extinct relative.