Description
The Osmunda claytoniana fronds are bipinnate, 40–100 cm tall and 20–30 cm broad, the blade formed of alternate segments forming an arching blade tightening to a pointed end. The lower end is also slightly thinner than the rest of the frond because the first segments are shorter. Three to seven short, cinnamon-colored fertile segments are inserted in the middle of the length, giving the plant its name.
In their absence, the plant in all its stages appears similar to Osmundastrum cinnamomeum (Cinnamon Fern). To distinguish them, look at the base of the segments; where O. cinnamomeum has typical felt-like hairs, the few hairs present on O. claytoniana are extremely short, usually requiring a magnifying glass to see well.
Like other species in the family Osmundaceae, it grows a very large rhizome, with persistent stipe bases from previous years. It forms small, dense colonies, spreading locally through its rhizome, and often forming fairy rings.
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