View source for Polystichum andersonii

{{Treatment/ID
|accepted_name=Polystichum andersonii
|accepted_authority=M. Hopkins
|publications={{Treatment/Publication
|title=Amer. Fern J.
|place=3: 116, plate 9. 1913
|year=1913
}}
|common_names=Anderson's sword fern
|basionyms=
|synonyms={{Treatment/ID/Synonym
|name=Polystichum braunii subsp. andersonii
|authority=(M. Hopkins) Calder & Roy L. Taylor
}}{{Treatment/ID/Synonym
|name=Polystichum braunii var. andersonii
|authority=(M. Hopkins) Hultén
}}
|hierarchy=Dryopteridaceae;Polystichum;Polystichum andersonii
|hierarchy_nav=<div class="higher-taxa"><div class="higher-taxon"><small>family</small>[[Dryopteridaceae]]</div><div class="higher-taxon"><small>genus</small>[[Polystichum]]</div><div class="higher-taxon"><small>species</small>[[Polystichum andersonii]]</div></div>
|volume=Volume 2
|mention_page=
|treatment_page=
}}<!--

--><span class="statement" id="st-d0_s0" data-properties="stem orientation"><b>Stems </b>erect.</span> <span class="statement" id="st-d0_s1" data-properties="leaf architecture;leaf orientation;leaf some measurement"><b>Leaves </b>monomorphic, arching, 3–10 dm;</span> <span class="statement" id="st-d0_s2" data-properties="bulblet count">bulblets 1 or more, on distal 1/3 of rachis.</span> <span class="statement" id="st-d0_s3" data-properties="petiole length;petiole architecture or pubescence"><b>Petiole </b>1/8–1/4 length of leaf, densely scaly;</span> <span class="statement" id="st-d0_s4" data-properties="scale coloration;scale size">scales light-brown, diminishing in size distally.</span> <span class="statement" id="st-d0_s5" data-properties="blade shape;blade shape"><b>Blade </b>lanceolate, 1-pinnate-pinnatifid;</span> <span class="statement" id="st-d0_s6" data-properties="base shape">base narrowed.</span> <span class="statement" id="st-d0_s7" data-properties="pinna shape;proximal pinna shape;proximal pinna arrangement;proximal pinna some measurement"><b>Pinnae </b>lanceolate-falcate, proximal pinnae ± triangular, not overlapping, in 1 plane, 2–10 cm;</span> <span class="statement" id="st-d0_s8" data-properties="base orientation or shape;auricle orientation;auricle development">base oblique, acroscopic auricle well developed;</span> <span class="statement" id="st-d0_s9" data-properties="margin shape;segment fusion;segment architecture or shape;costa some measurement;tooth orientation">margins incised to costae, segments adnate to costa for at least 2 mm, serrulate-spiny with teeth ascending;</span> <span class="statement" id="st-d0_s10" data-properties="apex shape">apex acute with subapical and apical teeth same size;</span> <span class="statement" id="st-d0_s11" data-properties="microscale shape;microscale density;microscale count or density;projection arrangement or shape">microscales filiform, with contorted projections, dense abaxially, sparse adaxially.</span> <span class="statement" id="st-d0_s12" data-properties="indusium architecture or pubescence or shape"><b>Indusia </b>sparsely ciliate.</span> <span class="statement" id="st-d0_s13" data-properties=""><b>Spores </b>light-brown to brown.</span> <span class="statement" id="st-d0_s14" data-properties="spore coloration;spore coloration;spore coloration;2n chromosome count">2n = 164.</span><!--

-->{{Treatment/Body
|habitat=Lowland coastal to midmontane forests, interior moist forests
|elevation=100–1700 m
|distribution=B.C.;Alaska;Idaho;Mont.;Oreg.;Wash.
|discussion=<p>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.</p>
|tables=
|references=
}}<!--

--><!--

-->{{#Taxon:
name=Polystichum andersonii
|author=
|authority=M. Hopkins
|rank=species
|parent rank=genus
|synonyms=Polystichum braunii subsp. andersonii;Polystichum braunii var. andersonii
|basionyms=
|family=Dryopteridaceae
|habitat=Lowland coastal to midmontane forests, interior moist forests
|elevation=100–1700 m
|distribution=B.C.;Alaska;Idaho;Mont.;Oreg.;Wash.
|reference=None
|publication title=Amer. Fern J.
|publication year=1913
|special status=
|source xml=https://jpend@bitbucket.org/aafc-mbb/fna-fine-grained-xml.git/src/287ef3db526bd807d435a3c7423ef2df1e951227/V2/V2_378.xml
|genus=Polystichum
|species=Polystichum andersonii
|2n chromosome count=164
|apex shape=acute
|auricle development=developed
|auricle orientation=acroscopic
|base orientation or shape=oblique
|base shape=narrowed
|blade shape=1-pinnate-pinnatifid;lanceolate
|bulblet count=1
|costa some measurement=2
|indusium architecture or pubescence or shape=ciliate
|leaf architecture=monomorphic
|leaf orientation=arching
|leaf some measurement=3dm;10dm
|margin shape=incised
|microscale count or density=sparse
|microscale density=dense
|microscale shape=filiform
|petiole architecture or pubescence=scaly
|petiole length=1/8 length of leaf;1/4 length of leaf
|pinna shape=lanceolate-falcate
|projection arrangement or shape=contorted
|proximal pinna arrangement=not overlapping
|proximal pinna shape=triangular
|proximal pinna some measurement=2cm;10cm
|scale coloration=light-brown
|scale size=diminishing
|segment architecture or shape=serrulate-spiny
|segment fusion=adnate
|spore coloration=light-brown;brown
|stem orientation=erect
|tooth orientation=ascending
}}<!--

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