Polystichum lemmonii

Polystichum lemmonii is a species of fern known by the common names Lemmon's holly fern and Shasta fern. It is native to western North America from the Sierra Nevada of California north to Washington. It is also known from British Columbia, where there is a single occurrence in the mountains above the Okanagan Valley.[1]

Polystichum lemmonii

Apparently Secure  (NatureServe)
Scientific classification Edit this classification
Kingdom: Plantae
Clade: Tracheophytes
Division: Polypodiophyta
Class: Polypodiopsida
Order: Polypodiales
Suborder: Polypodiineae
Family: Dryopteridaceae
Genus: Polystichum
Species:
P. lemmonii
Binomial name
Polystichum lemmonii

Description

This fern produces several narrow, erect lance-shaped leaves 10 to 35 centimeters long. Each leaf (frond) is made up of many oval leaflets (pinnae) which are overlapping, folded, and twisted such that the leaves may appear almost cylindrical in outline. Leaflet margins are entire or bluntly dentate.[2][3]

Habitat

P. lemmonii grows in mountainous habitat on ultramafic rock substrates, almost always in serpentine soils or among serpentine rocks.[2][3] Though it grows in very restricted areas, P. lemmonii can be locally very abundant.

  • On ultramafic rock in Wenatchee Mountains
    On ultramafic rock in Wenatchee Mountains
  • Adaxial (upper) leaf surface
    Adaxial (upper) leaf surface
  • Abaxial (lower) leaf surface with sori
    Abaxial (lower) leaf surface with sori
  • On Bean Peak in Wenatchee Mountains
    On Bean Peak in Wenatchee Mountains

References
  1. Recovery strategy for the Lemmon's holly fern (Polystichum lemmonii) in British Columbia. BC Ministry of Environment, July 2007.
  2. Hitchcock, C.L. and Cronquist, A. 2018. Flora of the Pacific Northwest, 2nd Edition, p. 64. University of Washington Press, Seattle.
  3. Burke Herbarium Image Collection| http://biology.burke.washington.edu/herbarium/imagecollection/taxon.php?Taxon=Polystichum%20lemmonii
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