View source for Cystopteris reevesiana

{{Treatment/ID
|accepted_name=Cystopteris reevesiana
|accepted_authority=Lellinger
|publications={{Treatment/Publication
|title=Amer. Fern J.
|place=71: 92. 1981
|year=1981
}}
|common_names=Southwestern brittle fern
|basionyms=
|synonyms={{Treatment/ID/Synonym
|name=Cystopteris fragilis subsp. tenuifolia
|authority=Clute
}}
|hierarchy=Dryopteridaceae;Cystopteris;Cystopteris reevesiana
|hierarchy_nav=<div class="higher-taxa"><div class="higher-taxon"><small>family</small>[[Dryopteridaceae]]</div><div class="higher-taxon"><small>genus</small>[[Cystopteris]]</div><div class="higher-taxon"><small>species</small>[[Cystopteris reevesiana]]</div></div>
|volume=Volume 2
|mention_page=
|treatment_page=
}}<!--

--><span class="statement" id="st-undefined" data-properties=""><b>Stems </b>creeping, not cordlike, internodes usually long, with scattered persistent petiole bases, hairs absent; scales tan to brown, ovate to lanceolate, radial walls thin, luminae tan. <b>Leaves</b> monomorphic, clustered at stem apex, to 45 cm, bearing sori throughout year. <b>Petiole</b> highly variable in color, from uniformly dark purple to uniformly straw-colored, but mostly dark purple at base, grading to straw-colored at junction with blade, shorter than blade, base sparsely scaly. <b>Blade</b> ovate to elliptic, 2–3-pinnate, widest at or just below middle, apex short-attenuate; rachis and costae lacking gland-tipped hairs or bulblets; axils of pinnae with occasional multicellular, gland-tipped hairs. <b>Pinnae</b> usually perpendicular to rachis, not curving toward blade apex, margins dentate to crenate; proximal pinnae pinnate-pinnatifid to 2-pinnate, ± equilateral, basiscopic pinnules not enlarged; basal basiscopic pinnules mostly short-stalked, base truncate to obtuse, distal pinnae deltate to ovate. <b>Veins</b> directed into teeth and notches. <b>Indusia</b> cup-shaped to lanceolate, gland-tipped hairs absent. <b>Spores</b> spiny, usually averaging 33–41 µm. <b>2n</b> = 84.</span><!--

-->{{Treatment/Body
|phenology=Sporulating summer–fall.
|habitat=Terrestrial or on rock on variety of substrates
|elevation=1500–4000 m
|distribution=Ariz.;Colo.;N.Mex.;Tex.;Utah;Mexico.
|discussion=<p>The finely dissected leaves, dark petioles, creeping stems, smaller spores, and terrestrial habit distinguish <i>Cystopteris reevesiana</i> from <i>C. fragilis</i> in the southwest. On rock and at high elevations, however, <i>C. reevesiana</i> can have stems with short internodes and leaves that are reduced in size and dissection (resembling <i>C. fragilis</i>). In southern Colorado, the two species are sympatric in some areas and form triploid hybrids. <i>Cystopteris reevesiana</i> and <i>C. bulbifera</i> are the diploid progenitors of <i>C. utahensis</i>, which occasionally crosses with <i>C. reevesiana</i> to produce sterile triploid hybrids of intermediate morphology.</p>
|tables=
|references=
}}<!--

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-->{{#Taxon:
name=Cystopteris reevesiana
|author=
|authority=Lellinger
|rank=species
|parent rank=genus
|synonyms=Cystopteris fragilis subsp. tenuifolia
|basionyms=
|family=Dryopteridaceae
|phenology=Sporulating summer–fall.
|habitat=Terrestrial or on rock on variety of substrates
|elevation=1500–4000 m
|distribution=Ariz.;Colo.;N.Mex.;Tex.;Utah;Mexico.
|reference=None
|publication title=Amer. Fern J.
|publication year=1981
|special status=
|source xml=https://jpend@bitbucket.org/aafc-mbb/fna-data-curation.git/src/8f726806613d60c220dc4493de13607dd3150896/coarse_grained_fna_xml/V2/V2_369.xml
|genus=Cystopteris
|species=Cystopteris reevesiana
}}<!--

-->[[Category:Treatment]][[Category:Cystopteris]]