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| Plants reproduce by spores (without embryo or true flower). Leaves (fronds) not closely overlapping; or if narrow and slightly overlapping, then has no axillary spore cases. Wall of spore case one layer of cells thick. Frond without spores pinnately compound, with spores very different. Spore cases on stalks which pass into a vertical jointed incomplete ring which breaks open the spore case as it straightens cross-wise. | |
| Flora of North America: Discussion, key to genera (opens new window) | |
| Flower Formula: | Glossary |
| Genus (Click for Taxon List) |
WI Taxa (map link) |
Photo | Genus Traits | Google Searches |
|---|---|---|---|---|
| Polypodium
polypody |
1 |  |
Images Information |