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| | NPWRC :: Aquatic and Wetland Vascular Plants |
 | | Sterile fronds pinnate at the base, pinnatifid upward, the rachis broader-winged toward the tip; blades mostly 10-30 cm long, 10-35 cm wide, with 8-12 pairs of opposite pinnae, these sinuate to pinnatifid, 1-3 cm wide, sparsely white-hairy on the veins beneath, the veins anastomosing; petioles shorter to about as long as the blade. |
 | | Fertile frond surpassed by the sterile ones; blade pinnate-pinnatifid, mostly 5-15 cm long; pinnae strongly ascending, 2-5 cm long, divided into bead-like pinnules with inrolled margins enclosing the sori, the pinnules 3-4 mm wide, becoming dry, hard, eventually separating to release the spores; sori globose, covered by a delicate, hoodlike indusium. |
 | | Onoclea sensibilis, a vegetative frond with pinnatifid divisions and an associated dark brown fertile frond, both arising from a rhizome. |
| www.npwrc.usgs.gov /resource/plants/vascplnt/species/onocsens.htm (212 words) |
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