Adiantum jordanii aka California Maidenhair Fern

Adiantum jordanii, also known as California Maidenhair, is a perennial species of maidenhair fern that belongs to the Vittarioideae subfamily of the Pteridaceae family. This fern is native to California and Baja California, where it grows in shaded woods under oaks and pines. It can also be found in the southernmost part of its range in Baja California, along with flora associates such as Mimulus aridus and Daucus pusillus. Each trailing leaf of Adiantum jordanii can reach over half a meter in length and is made up of many rounded green segments. These segments have two to four lobes and may split between the lobes, with the underside of each segment bearing one to four sori. However, Adiantum jordanii is a carrier of the fungus-like oomycete Phytophthora ramorum, which causes Sudden Oak Death. The USDA enforces an import control, focusing intensely on areas (CA, OR, NY in U.S.) that are infected with Sudden Oak death. When sold, they must be identified by place of origin and must also be accompanied by a phytosanitary certificate. The USDA warns against taking cuttings from wild specimens. Despite its potential danger, Adiantum jordanii is used in native plant and wildlife gardens and is also a relatively rare houseplant that requires regular watering to thrive. It does best in abundant sunlight and grows best in soil that is good at retaining moisture. The plant should be no more than 3 feet away from a window and doesn't require added fertilizers if it is repotted each time it doubles in size. If the fern dries out, it will go summer dormant and appear dead.