Marattia salicina, commonly known as the king fern, is a species of large fern found in tropical regions. Synonyms for this plant include Ptisana salicina, Marattia alata, and Angiopteris salicina. This fern has large, deep green fronds that can grow up to 5 feet in length and 2 feet in width. It is an evergreen perennial that thrives in moist, shady environments such as rainforests, and it also adds a tropical feel to gardens and landscapes. The king fern is known for its medicinal properties and has been used in traditional medicine to treat various ailments such as fever, inflammation, and digestive problems.