2 Maidenhair. Adiantum
Ferns with much divided leaves and short, marginal sori borne at the ends of free-forking veins, on the under side of the reflexed and altered portion of the pinnules, which serves as an indusium. Stipes and branches of the leaves very slender and polished.
(Greek, unwetted, because drops of water roll off without wetting the leaves.)