Bracken Fern (Pteridium acquilinum) – A large deciduous fern that grows everywhere in the world except for the hot and cold deserts and Antarctica. As ferns, brackens do not have seeds or fruits, but the immature fronds, known as fiddleheads, are edible. Plants send up large, triangular fronds and may form large thickets. Spore cases form along the underside edge of the leaflets. Evolutionarily, bracken may be considered one of the most successful and one of the oldest ferns, with fossil records dating back 55 million years.