examples of ferns![click to hear](/images/speaker.jpg)
There are more than 10,000 species of fern, varying in height from a a fraction of an inch to several feet.
tree fern ![click to hear](/images/speaker.jpg)
Large fern that resembles a tree and can reach heights of up to 65 ft; it grows mainly in the tropics.
trunk ![click to hear](/images/speaker.jpg)
Main part of the fern, composed of a vertical rhizome covered with the stubs of old fronds and, often, with aboveground adventitious roots.
bird’s nest fern ![click to hear](/images/speaker.jpg)
Fern that usually grows out of another plant without deriving nourishment from it; its fronds grow in a rosette around a central rhizome, hence its name.
common polypody ![click to hear](/images/speaker.jpg)
Fern with fronds up to a foot long; it is usually found in damp overgrown soil, on rocks or tree trunks.