Ferns and Horsetails

Basic Description: Flowerless green plants reproducing via spores, not seeds (seeds carry their own nutrients to enable germination, spores carry no nutrients and rely on outside resources for germination). New fronds emerge each spring, starting out as "fiddlehead" buds seeming to unroll as they grow and mature. Most ferns prefer shady and damp areas. They range from sea level up to 10,000 feet altitude. Ferns are found in many sizes from a few inches to several feet tall. Often many species intermixed in close proximity. This section includes Horsetail, even though technically it is not a fern.

Anatomy: The major part of the fern seen above ground is called the "Frond". Most ferns have many fronds emerging from a common set of roots. The components of a frond are:

Local ferns are found in three basic forms: Once pinnately compound, where the main stem is the pinna with pinnules growing directly on that main stem (examples are Western Swordfern, Deer Fern and Licorice Fern); twice pinnately compound, where the pinnules grow out of secondary stems (examples are Lady Fern, Maidenhair Fern and Wood Fern); and thrice pinnately compound, where the pinnules grow on a tertiary stem (example is the Bracken Fern). Illustrations are provided with the description of each specific specie.

History: Ferns have been around for a long time. Fossils, as old as 400 million years (the Devonian period) have been found. Ferns flourished later in the Carboniferous period (300 to 350 million years ago) when the Earth's climate was warm and vast forests of gigantic ferns and horsetail covered the land masses. Decomposition of these fern forests created large underground liquid petroleum deposits. Today we are using these ancient plants to fuel our automobiles in the form of gasoline.

ALPINE LADY FERN
Fern Family
Athyrium distentifolium

The alpine lady fern prefers wet talus slopes, rocky hillsides, and subalpine meadows, from mid-elevations to 10,000 feet. It is smaller than the lady fern (A. filix-feminina), reaching a height of 8-32". Lance-shaped fronds, doubly or trebly compound, range from 6" x 1" to 22" x 10" in size. Short-stalked, triangular pinnae are more finely dissected than those of the lady fern.

Distribution includes the Pacific Northwest and much of the Rockies, stretching north to Alaska. It is also found in Greenland, Newfoundland, and the Yukon, with relatives in Europe and Japan. Taxonomy for this plant is in dispute. It is named either A. distentifolium or A. alpestre, and the American plant is alternately called a subspecies or a variety.

BRACKEN FERN
Fern Family
Pteridium aquilinum

Widespread and variable throughout the Western U.S. and Canada, extending from the coast to the desert at altitudes of sea level to 10,000'. Bracken Ferns like open sunny areas and partial shade in soft soil where the roots can penetrate. Bracken ferns grow as single fronds ranging from 3' to 7' in height. A distinguishing feature is that pinnae appear on the third branch as illustrated. These are very invasive and hardy fellows, almost impossible to eradicate. The deep root system is almost immune to forest fires. As children, we used the primary stipe, stripped of all branches, as spears in mock battles.

COMMON HORSETAIL
Horsetail Family
Equisetum arvense

Horsetail is easily recognized by the vertical, jointed, hollow stems (up to 1/2" diameter). Sterile stems have several long, narrow leaves growing like fringes all around the circumference at each joint. Fertile stems are not similarly fringed, but have a cone like growth at the top which holds the spores. They grow abundantly in all kinds of soil from sea level to 8,500'. Common Horsetail is one of the most widespread plants in the world and is frequently a gardener's nightmare - almost impossible to eradicate. Horsetails have a long history, dating back to the Devonian period (400 million years ago). Because of their rough texture they were commonly used throughout the ancient world for scouring cooking vessels. Horsetail was one of the first plants to reappear after the Mt. St. Helens eruption in 1980.

COMMON SWORD FERN
Fern Family
Polystichum munitum

Very common in shady, damp, rich woods from sea level to 2,500' throughout western parts of Washington, Oregon, British Columbia and northern California. Grow in large, dense clumps 2 to 3 feet high. Once pinnately compound, distinguished by pinules growing directly out of primary stem starting near the base. Named because profile of each frond is shaped something like a medieval broadsword; wide at the base, tapering to the tip. As in most ferns, clusters of brownish spores accumulate on the back side. If you notice that the tips of fronds are missing, that is a sign that a colony of Mountain Beaver lives nearby. Sword Ferns and Stinging Nettle are the Mountain Beaver's choice foods. Native Americans used Swordferns for mattresses and to line floors and fire pits.

DEER FERN
Fern Family
Blechnum spicant

Found throughout low, sea level to 2,000', coastal regions in moist forests. Deer Ferns have two types of fronds. Both types grow together out of common root clumps.
Sterile fronds up to 2' long. Pinnules grow directly on the main stem, starting near the base. The pinnules are short at the base of the frond, lengthen at the center and taper back to the tip. The sterile fronds usually lie relatively flat to the ground and contain no spores on their back side.
Fertile fronds which have widely spaced narrow pinules, are taller and more erect than the sterile fronds. The back side are covered with spores.
Deer ferns were used by natives to sooth skin sores, a practice learned by watching deer rub their antler stubs after the antlers fell off.

LADY FERN
Fern Family
Athyrium filix-femina

Delicate, pale green fronds have diamond shaped profiles (pinnules are short at the base, getting longer at the center then tapering off toward the tip). They can reach heights over 5'. They grow in moist forests, swamps and thickets where the soil is soft to allow root penetration at all altitudes from sea level to 6,000'. The fronds will look ragged and worn out by early fall. Aboriginal people used Lady Ferns for covering berries while drying. Name "Lady Fern" derived from profile - narrow at the ankles and shoulders, wide at the hips.

LICORICE FERN
Fern Family
Polypodium glycyrrhiza

These small ferns rarely grow larger than 2.5'. They like logs and wet mossy ground from sea level to 2,000'. A favorite habitat is aloft growing on tree trunks or limbs. Look for Licorice Ferns on branches of the Big Leaf Maple in shady lowland forests. Fairly broad pinnules grow along the primary stem to form once-pinnate fronds. The name is derived from licorice flavored rootlets. Several local Native American tribes chewed these rootlets for flavor and used them as medicine for colds and sore throats.

MAIDENHAIR FERN
Fern Family
Adiantum pedatum

These ferns are unique in structure having a dark vertical stem (stipe) which branches out fan like into several pinna which are nearly horizontal. They are 1' to 2.5' tall; like rocky, shady, moist areas from sea level to 10,000'. Look for them along streams or in the spray zone of waterfall. Maidenhair Ferns were once exported and used by herbalists as cough medicine. Native Americans used the delicate black stipe to decorate baskets. The name was derived from the black, glossy, hair-like stalks or from the masses of dark root hairs.

WOOD FERN
Family
Dryopteris austriaca

Fronds have a triangular profile, pinules long at the base of the pinna tapering off to points at the tip.The stipes are long and scaley. Erect fronds may reach over 3' tall and grow in clusters. They like to grow in moist, richly soiled forests and openings and on scree slopes from sea level to 1,500' elevation. Rootstocks resemble a pineapple and were often eaten as a starchy food source.

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CAUTION: Do not attempt to eat any wild plants or berries until you have thoroughly checked to determine if they are safely edible.

BIBLIOGRAPHY:

  • "A Field Guide to the Cascades & Olympics", Stephen R. Whitney, 1983.
  • "Mountain Flowers of the Cascades & Olympics", Harvey Manning, Bob Spring and Ira Spring, 1979.
  • "Mosses, Lichens & Ferns", Dale H. Vitt, Janet E. Marsh and Robin B. Bovey, 1988.
  • "Pacific coast Fern Finder", Glenn Keator and Ruth M. Heady, 1981.
  • "Plants of the Pacific Northwest Coast", Jim Pojar and Andy MacKinnon, 1994.
  • "Trees, Shrubs & Flowers to Know in Washington & British Columbia", C.P.Lyons & Bill Merilees.

Photos and text have been contributed by: Gary Stock, Carol Madison, Rich Baldwin, and Bill Sunderland.

If you would like to contribute to our Online Flora and Fauna Guide please email us at web@wta.org. Please send scanned images as attached .JPG files in the 40-80Kb range. Close-ups that show details of indiviudal flowers, berries, leaves or cones are preferred. All photos and text must be originals!