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Adiantum capillus-veneris
Small, toothed, heart-shaped leaves. Leaves grow in bunches. It has many intriguing names including venus hair fern.
Seen growing on the outer walls of the Thurston Lava Tube (Nahuku) in a tropical rainforest. Volcanic soil. Moderate shade. Altitude 4065 ft. Hawai'i Volcanoes National Park.