Compilation
Polystichum braunii

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Name

Identification
Polystichum braunii C.Chr. & Hultén [family DRYOPTERIDACEAE ] Verified by Anthony Clive Jermy, Polystichum bakerianum (Atk. & C.B.Clarke) Diels [family DRYOPTERIDACEAE ] Verified by Li-Bing Zhang, Polystichum microchlamys (Christ) Matsum. [family DRYOPTERIDACEAE ] (stored under name);
Related name
  • Polystichum sp.
  • Polystichum bakerianum
  • Polystichum microchlamys
  • Polystichum andersonii x braunii
  • Polystichum andersonii
  • Polystichum alaskense
  • Polystichum kwakiutlii
  • Polystichum braunii
Common name
  • polystic de braun, Flora of North America Vol. 2
  • Anderson's sword fern, Flora of North America Vol. 2
  • Braun's holly fern, Flora of North America Vol. 2

Flora

Entry for Polystichum andersonii M. Hopkins [family DRYOPTERIDACEAE]
Herbarium
Flora of North America (FNA)
Collection
Flora of North America
Resource Type
Reference Sources
Entry From
Flora of North America, Vol 2,
Names
Polystichum andersonii M. Hopkins [family DRYOPTERIDACEAE], Amer. Fern J., 3: 116, plate 9. 1913
Polystichum braunii (Spenner) Fée subsp. andersonii (M. Hopkins) Calder & Roy L. Taylor [family DRYOPTERIDACEAE]
Polystichum braunii var. andersonii (M. Hopkins) Hultén [family DRYOPTERIDACEAE]
Treatment Author(s)
David H. Wagner
Information
Stems erect. Leaves monomorphic, arching, 3--10 dm; bulblets 1 or more, on distal 1/3 of rachis. Petiole 1/8--1/4 length of leaf, densely scaly; scales light brown, diminishing in size distally. Blade lanceolate, 1-pinnate-pinnatifid; base narrowed. Pinnae lanceolate-falcate, proximal pinnae ± triangular, not overlapping, in 1 plane, 2--10 cm; base oblique, acroscopic auricle well developed; margins incised to costae, segments adnate to costa for at least 2 mm, serrulate-spiny with teeth ascending; apex acute with subapical and apical teeth same size; microscales filiform, with contorted projections, dense abaxially, sparse adaxially. Indusia sparsely ciliate. Spores light brown to brown. 2 n = 164.
Altitude range
100--1700 m
Distribution
USA AlaskaUSA IdahoUSA Mont.USA Oreg.USA Wash.Canada B.C.
Discussion
Polystichum andersonii is an allotetraploid (D. H. Wagner 1979); its diploid parents are P . munitum and P . kwakiutlii . The triploid cross, P . munitum × andersonii , has been analyzed cytologically (W. H. Wagner Jr. 1973). It is the only sterile hybrid in the genus that develops large colonies through vegetative propagation by its bulblets. Hybrids look very much like some of the more deeply incised forms of Polystichum munitum except that they have abundant filiform scales, abortive sori, and nearly triangular lowermost pinnae with ± equally incised acroscopic and basiscopic auricles.

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