Pteris ensiformis, the slender brake, silver lace fern, sword brake fern, or slender brake fern, is a plant species in the genus Pteridoideae subfamily of the Pteridaceae. It is found in Asia and the Pacific.
The Pteris genus includes a huge variety of species, mostly ranging from the tropics and subtropics, although there are a few temperate species. Collectively known as brake ferns, many have flat, pinnate fronds that hardly resemble the traditional idea of a fern. The most popular ones for indoor cultivation tend to be relatively tough plants, often with beautiful variegation that makes them look harder to grow than they actually are. In fact, and especially for ferns, these tend to be fairly tough plants that require only adequate moisture and protection from very dry air (both in summer and winter) to do well. The smaller species make excellent tabletop plants.