WHERE’S WILDLIFE • FERN & HORSETAIL FIELD GUIDE

Cinnamon Fern

Osmundastrum cinnamomeum

Also known as Osmunda cinnamomea.

Upright cinnamon-brown fertile fronds rise separately from the green leafy fronds of this wetland fern.

Cinnamon Fern. Select the photo to open the gallery.

NATIVE • NORTH AMERICA

At a glance

Plant group Fern
Life cycle Perennial
Reproduction Spores
Habitat Wet woods, bog margins, and stream edges

Sightings map

Explore reported observations. Sightings are not a complete range map.

How to recognize it

Key identification clues

  • Green fronds form a clump and are divided into deeply lobed pinnae.
  • Separate narrow fertile fronds turn cinnamon brown.
  • A woolly tuft at the underside of each pinna base helps distinguish it from Interrupted Fern.

Where and when to look

Look in moist to wet ground. Spring brings woolly fiddleheads; fertile fronds later turn brown and wither.

Compare similar plants

Interrupted Fern bears fertile portions in the middle of an otherwise leafy frond. Cinnamon Fern has separate fertile fronds.

A closer look

Green fronds

The large leafy fronds gather around the crown. Compare their outline and the depth of the divisions.

Cinnamon-colored spores

The upright brown structures are fertile fronds, not flowers. They bear the structures that produce spores.

Woolly fiddleheads

New fronds emerge tightly curled and covered with pale wool. The gallery includes both close and wider views of this stage.

Field photographs

11 selected field photographs. Select any image to enlarge it and browse the slideshow. Use Load more photos to reveal the remaining images.

Range & habitat

A fern of eastern North American wetlands and damp woods, often on acidic soils.

Explore related content

Sources & further reading

Field photographs: Where’s Wildlife.

Comments & Identification Feedback

Spotted a possible identification error or have an observation to share? Leave a comment below. For an ID correction, include the photo filename and the features that support your suggestion.

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