Adiantum raddianum aka Delta Maidenhair

Adiantum raddianum, also known as the Delta maidenhair fern, is a popular indoor fern native to South America. Its shiny, dark leafstalks resemble human hair and its triangular fronds can reach up to 12 inches in length and 6 inches in width. This plant is typically found on forest floors, rock crevices, river banks, coastal cliffs, and basalt banks along trails and streams. The genus name Adiantum comes from the Greek word "adiantos", meaning "unwetted" in reference to the leaves. It is hardy down to 5 °C (41 °F) and requires high humidity, well-drained soil, bright indirect light, and a constant temperature. Maidenhair ferns originated in the Brazilian tropics and contain almost 200 different species, growing in temperate climates. Pacific Maidenhair Fern is a popular houseplant that needs regular watering and abundant sunlight, and should be less than 3 feet from a window. A. raddianum is suitable for USDA hardiness zones 10 and 11, but may be considered invasive in Hawaii and French Polynesia. The cultivars ‘Brilliantelse’ and ‘Kensington Gem’ have won the Royal Horticultural Society's Award of Garden Merit. With proper care, this fern can grow more beautiful with each passing year, and during the spring may produce fronds that contain fern spores for reproduction.