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©John Hagstrom

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Hagstrom, John

Athyrium filix-femina (L.) Roth ssp. angustum (Willd.) R.T. Clausen (subarctic ladyfern), fern, growth habit


Identifier
3.79976
Format
digital color photograph 
Digitization Status
Born digital
Type
Photographic image
Date created
2005 – 2012
Description
Athyrium filix-femina (L.) Roth ssp. angustum (Willd.) R.T. Clausen (subarctic ladyfern), deciduous fern that features lacy-cut erect or ascending 2-3-pinnate or pinnatifid finely-divided lanceolate light green fronds which grow in a dense circular shuttlecock-like clump to 2-3' tall, each frond (leaf) has twenty to thirty pairs of elliptic non-opposite pinna (leaflets) with narrow pointed tips, each pinna is divided into deeply-cut lanceolate to oblong pinnules (subleaflets), sori and indusia are found on the undersides of the pinnules, Subsp. angustum, commonly called northern lady fern primarily differs from the species by (a) yellow spores, (b) erect to ascending rhizomes, (c) elliptic pinnae with widest part of the frond near the middle, and (d) stipes (stems) are about the same length as the blades