Woodsia ilvensis is a species of fern that is commonly known as the Irish woodsia or rusty woodsia. The plant is native to the rocky areas in Europe and North America, and it is widely cultivated as an ornamental plant in gardens. There are several synonyms for this species, including Woodsia alpina, Woodsia ilvensis var. tenuifolia, and Woodsia interrupta. The Irish woodsia is characterized by its bright green fronds and rusty-colored spores, which are produced on the underside of the leaves. This plant is ideal for rock gardens or in moist, shaded areas and requires minimal maintenance.