Fern with elegant fronds that can reach a length of 30 cm (ft.) A solution or extract of maidenhair fern is frequently used in Latin America and informally in Europe as a decongestant to treat coughs, bronchitis, sore throats, and chronic nasal catarrh. The plant has a long history of being used as a treatment for hair and scalp issues. Similar Species Since A. caudatum has been proven to have antispasmodic properties, it may be helpful in the management of asthma.