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"Polypodium widely distributed throughout the world, but specially developed in the tropics. The species differ greatly in size and general appearance and in the character of the frond; the sori or groups of spore—cases (sporangia) are borne on the back of the leaf, are globose and naked, that is, are not covered with a membrane (indusium)." —Encyclopaedia Britannica Company, 1910

Common Polypody Leaf with Sori

"Polypodium widely distributed throughout the world, but specially developed in the tropics. The species…

A Common Polypody, or Polypodium vulgare, leaf and root. The fern is commonly found on walls, river banks, and trees. On the leaf, the common polypody will develop a few spots, called sori, over time.

Leaf and Root of Common Polypody

A Common Polypody, or Polypodium vulgare, leaf and root. The fern is commonly found on walls, river…