northern maidenhair

(Adiantum pedatum)

               
Conservation Status

IUCN Red List

not yet assessed

northern maidenhair

NatureServe

N5 - Secure

SNR - Unranked

Minnesota

not listed

Wetland
Indicator
Status

Great Plains

FAC - Facultative

Midwest

FACU - Facultative upland

Northcentral & Northeast

FACU - Facultative upland

Nativity

Native

 
Occurrence

Common

 
Habitat

Moderate moisture. Deciduous woods. Shade.

 
Sporulation

July to September

     
Height

12 to 24

     

Identification

This is a 12 to 24 tall, erect, perennial fern that rises on a single frond or a few fronds from a short, creeping rhizome and black, hair-like roots.

The leaves (fronds) are erect, arching, closely spaced, 15¾ to 30 long, and deciduous. The leaf stem (stipe) is purple or purplish-black, grooved, hairless, and occasionally covered with a whitish, waxy bloom (glaucous). It is to 2 long and divided at the top into two equal branches (rachises) that are arched to bent backwards. The blades are held horizontally, 90° to the stipe, roughly parallel to the ground.

The blade is kidney-shaped to almost circular, 6 to 11¾ long, and 6 to 13¾ wide. Each rachis has 2 to 9 primary leaf segments (pinnae) attached to the upper side each rachis. The pinnae closest to the stipe are the largest and have mostly 15 to 35 widely spreading leaflets (pinnules). The pinnae become progressively shorter as they approach the tip.

The pinnules are alternate, short stalked, oblong to nearly rectangular, ½ to long, and 3 16 to wide, about 3 times as long as wide. The terminal and lowest pinnule is fan-shaped. The main vein is along the lower margin. The lateral veins are easily seen. The lower margin is unlobed, untoothed, and slightly curved. The upper margin is lobed. The lobes are separated by narrow sinuses, and toothed with rounded teeth. The upper surface is green and hairless. The underside is green and is not covered with white powder. They repel water, so that after a rain they look dry with water beads on the surface.

On fertile pinnules the upper margin is bent backward into a membranous flap (indusium) on which oblong, spore-bearing structures (sporangia) are borne in a compact cluster (sorus). There are 64 yellow to light brown spores per sporangium. Spores are produced from July to September.

 
Similar
Species

 


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

Comments

 


Taxonomy

Order:

Polypodiales (true ferns)

 

Family:

Pteridaceae (maidenhair fern)

 

Subfamily:

Adiantoideae

 
Synonyms

 

 
Common
Names

northern maidenhair

pointerweed

five-finger fern

maidenhair fern

northern maidenhair 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.

 

glaucous

Pale green or bluish gray due to a whitish, powdery or waxy film, as on a plum or a grape.

 

indusium

In ferns, a veil covering the cluster (sorus) of spore-producing structures (sporangia).

 

pinna

The primary division of a compound leaf or fern frond.

 

pinnule

The ultimate segment (individual leaflets) of a twice or more compound leaf or fern frond.

 

rachis

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

 

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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Other Videos

 
  Maidenhair Fern (Adiantum pedatum )
wvoutdoorman
 
   
 
About

Published on May 1, 2012

Maidenhair Fern (Adiantum pedatum )

 
     
  F01 Adiantum pedatum Séquence 1-Fougères 1.m4v
Jeanfilm2
 
   
 
About

Uploaded on Jan 10, 2010

La Capillaire du Canada du printemps à l'automne. Maiden-hair Fern from spring to fall. Helecho Adiantum pedatum de la primavera hasta el otoño. شعر ربيع كندا في الخريف. वसंत से शरद ऋतु के लिए कनाडा के बाल

 
     
  Learn about Maidenhair Fern (Adiantum pedatum) from Prairie Moon Nursery
PrairieMoonNursery
 
   
 
About

Uploaded on Nov 24, 2009

http://www.PrairieMoon.com - Watch this short video to discover more information about the Maidenhair Fern (Adiantum pedatum).

 
     
  Adiantum pedatum
wetvideocamera
 
   
 
About

Published on Jun 9, 2013

Maidenhair Fern - A beautiful fern with a large palmate series of fronds on black or deep red stipes. Often found in shady, well drained spray zones near waterfalls and swift streams. ( Adiantum pedatum ) June 8, 2013 Burnaby, BC

 
     

 

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