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The leaves of Microsorum punctatum, more commonly known as the Wart Fern, are covered in raised, wart-like structures known as sori. These sori are spore-producing structures characteristic of ferns. In the wart fern, the sori are actually located on the underside of the leaf, but are sunken so deep that they form wart-like protrusions on the upper leaf surface.
Welwitschia mirabilis is a unique desert plant that produces only 2 leaves in its entire life (although they split into segments over time, making it appear like the plant has more leaves), each lasting for up to 2000 years. Plants can survive for 100s of years in the desert by absorbing water from sea fog and deep ground water.