Pteridium aquilinum (Bracken)

Plant Info
Also known as: Western Bracken Fern
Genus:Pteridium
Family:Dennstaedtiaceae (Bracken Fern)
Life cycle:perennial
Origin:native
Habitat:part shade, sun; poor or sandy soil; upland woods, woodland edges
Fruiting season:summer
Plant height:1 to 3 feet
Wetland Indicator Status:GP: FACU MW: FACU NCNE: FACU
MN county distribution (click map to enlarge):Minnesota county distribution map
National distribution (click map to enlarge):National distribution map

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Detailed Information

Fiddlehead:

[photo of fiddlehead] Fiddleheads emerge in early spring, brown stems covered in silvery gray hair. Even before the leaves unfurl, the division of the stem into 3 parts is apparent.

Leaves and stems: Leaf attachment: whorl Leaf type: compound

[photo of fronds] At the top of  the stem is a whorl of 3 leaves, each 2 or 3 times compound and generally triangular in outline. The leaf blade is 2 to 4 feet long and 1 to 3 feet wide. The leaves are held almost horizontal, parallel to the ground.

[photo of leaflet underside] The shape of the leaflets varies, with 10 to 12 pair of deeply lobed segments that are oblong to narrowly triangular; segments may be further lobed. Veins are forked. Leaf and leaflet stalks (rachis) are green but turn dark brown later in the season, are slightly grooved, and may have miniscule rough hairs. The main stem (stipe) is brown near the base and covered in short hairs

Spores: Fruit type: spores on leaf

[photo of spores] Spores develop in mid to late June on the underside of the leaves in a continuous narrow band along the leaf edge, though the rolled edges may cover them. Spores may persist through late summer but are not always present.

Notes:

Bracken fern is very common and tends to form large colonies through underground rhizomes. It is easy to identify as it is the only fern that has 3 broadly triangular leaves that are held horizontally, at the top of a long stem. Bracken releases allelopathic chemicals that inhibit the growth of other plants and contains other toxins that are poisonous to many animals. It is the first plant to be killed by frost but will resprout quickly after a fire and can be weedy. An abundance of Bracken is usually indicative of a degraded habitat. There are 4 varieties of Bracken in North America, with var. latiusculum found in Minnesota.

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More photos

Photos by K. Chayka taken in Ramsey County. Photos courtesy Peter M. Dziuk taken in Anoka County.

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