ostrich fern

(Matteuccia struthiopteris var. pensylvanica)

               
Conservation Status

IUCN Red List

not yet assessed

ostrich fern

NatureServe

N5 - Secure

SNR - Unranked

Minnesota

not listed

Wetland
Indicator
Status

Great Plains

FACW - Facultative wetland

Midwest

FACW - Facultative wetland

Northcentral & Northeast

FAC - Facultative

Nativity

Native

 
Occurrence

Common

 
Habitat

Swamps, floodplain forests, rich woods, streambanks.

Sporulation

March to April

     
Height

12 to 60

     

Identification

This is a large, 12 to 60 tall, erect, perennial fern that rises from the above-ground crown of a vertical rhizome. The vertical rhizome produces numerous long-creeping, black, horizontal, underground runners (stolons) which root and give rise to new vertical rhizomes, producing new, genetically identical plants.

Each plant produces two types of leaves (fronds), a dense spiral of several green, sterile fronds, with 1 or a few brown, fertile fronds in the center. The smaller fertile fronds are sometimes hidden by the larger sterile fronds. Less robust or unhealthy plants may not produce fertile fronds.

The sterile frond is erect and arching. The leaf stem (stipe) is dark brown or black, stout, and 1¾ to 18 long. It is much shorter than the leafy portion (blade), about 1 10 to 1 5 as long. It is flattened at the base and becomes deeply grooved above the middle. It is sparsely covered with pale orangish-brown scales. It is deciduous and dies with the onset of winter.

The blades of the sterile fronds are inversely lance-shaped to inversely egg-shaped in outline, 12 to 50 long, and 4¾ to 10 wide. They are widest above the middle, taper quickly to the tip, and taper very gradually to the base. The overall appearance is similar to an ostrich feather, hence the common name. The blades are pinnately divided into 20 to 60 pairs of leaflets (pinnae). The central axis of the blade (rachis) is covered with white hairs.

The pinnae are alternate, spreading, and linear. The longest pinnae are 2½ to 5¼ long, becoming shorter as they approach the base. The lowest pinnae are much shorter, as little as long. The pinnae do not have a tuft of cinnamon-brown hairs at the base. They are deeply, pinnately lobed, with 20 to 40 lobes per side. The upper surface is medium green and hairless. The lower surface is paler green and hairless.

The lobes of the pinnae are alternate to almost opposite, broadly oblong, squared off at the base, and rounded at the tip. The veins visible on the underside of each lobe extend straight to the margin and are not forked. The margins of the lobes are untoothed and unlobed.

The fertile fronds are distinctive and unlike the sterile fronds. They appear on long stalks from July to October. When they appear they are 10 to 25½ long, and 1 to 2½ wide, shorter than the sterile fronds. There are 30 to 45 greenish pinnae per side. The pinnae are to 2 long, linear, and shallowly lobed. The lobes of the pinnae are curled tightly around the sori forming small bead-like structures. When they mature the fertile fronds turn dark brown. They persist through the following winter and release their spores in March and April.

 
Similar
Species

The above-ground, black, knob-like portion of the vertical rhizome, from which all fronds rise, the long-tapering blade, and the very short pinnae near the base of the blade are distinctive features of this plant.

Cinnamon Fern (Osmunda cinnamomea) does not rise from a black, knob-like crown. There is a small tuft of cinnamon brown hairs where the base of each pinna attaches to the rachis. The veins on the underside of the pinnae lobes are forked 1 to 3 times.

Interrupted Fern (Osmunda claytoniana) does not produce separate fertile fronds, the fertile pinnae being produced in the middle of otherwise sterile leaves. The veins on the underside of the pinnae lobes are forked once.


Distribution Distribution Map   Sources: 2, 3, 4, 5, 7, 28.

Comments

Taxonomy
This is the only species in the genus Matteuccia.


Taxonomy

Order:

Polypodiales (true ferns)

 

Family:

Onocleaceae (sensitive fern)

 
Synonyms

Matteuccia pensylvanica

Matteuccia struthiopteris var. pubescens

Onoclea struthiopteris

Onoclea struthiopteris var. pensylvanica

Pteretis nodulosa

Pteretis pensylvanica

 
Common
Names

fiddlehead fern

garden fern

hardy fern

ostrich fern


 

 

 

 

 

 

 

Glossary

Frond

A large leaf with many divisions: in ferns, the compound leaf, including the stipe and the blade; in mosses, a closely and regularly branched stem resembling a fern leaf; in lichens, a stalkless, leaf-like extension.

 

Linear

Long, straight, and narrow, with more or less parallel sides, like a blade of grass.

 

Pinna

The primary division of a compound leaf or fern frond.

 

Pinnate

Having the leaflets of a compound leaf arranged on opposite sides of a common stalk.

 

Rachis

The main axis of a compound leaf, appearing as an extension of the leaf stalk; the main axis of an inflorescence.

 

Rhizome

A horizontal, usually underground stem. It serves as a reproductive structure, producing roots below and shoots above at the nodes.

 

Sorus

A compact cluster of spore-bearing cases or sacs (sporangia) on a fern.

 

Sporangium

A spore bearing structure, as of a fern or moss.

 

Stipe

A supporting stalk-like structure lacking vascular tissue: in fungi, the stalk supporting the mushroom cap; in ferns, the stalk connecting the blade to the rhizome; in flowering plants, the stalk connecting the flower’s ovary to the receptacle; in orchids; the band connecting the pollina with the viscidium.

       

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Plant

  ostrich fern   ostrich fern
       
  ostrich fern   ostrich fern
       

Sterile Frond

  ostrich fern    
       

Fertile Frond

  ostrich fern   ostrich fern
       
  ostrich fern    
       

Pinnae

  ostrich fern    
       
       

 

Camera

     

Slideshows

   
  Matteuccia struthiopteris
Susanne Wiik
 
  Matteuccia struthiopteris  
 
About

Strutseving
Ostrich fern

 
     
  Ostrich Fern (Matteuccia struthiopteris)
Andree Reno Sanborn
 
  Ostrich Fern (Matteuccia struthiopteris)  

 

slideshow

     

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Other Videos

 
  F07 Matteuccia Struthyopteris Séquence 7-Fougères 1.m4v
Jean Désorcy
 
   
 
About

Uploaded on Jan 10, 2010

La Matteuccie du printemps à l'automne. Ostrich Fern from spring to fall. Helecho Matteuccia Struthiopteris de la primavera hasta el otoño.

 
     
  Matteuccia struthiopteris
wander van laar
 
   
 
About

Published on Jun 22, 2014

No description available.

 
     
  Ostrich Fern
woodswoman783
 
   
 
About

Uploaded on May 1, 2010

The fiddlehead of the ostrich fern is one of the best tasting of the wild edibles and one of the easiest ferns to ID. Fry it up in a little butter with wild leeks and/or morrel mushrooms and you have a wonderful side dish or an entire meal in the wild

 
     

 

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