View source for Cystopteris laurentiana

{{Treatment/ID
|accepted_name=Cystopteris laurentiana
|accepted_authority=(Weatherby) Blasdell
|publications={{Treatment/Publication
|title=Mem. Torrey Bot. Club
|place=21(4): 51. 1963
|year=1963
}}
|common_names=Laurentian bladder fern;cystoptère laurentienne
|basionyms={{Treatment/ID/Basionym
|name=Cystopteris fragilis var. laurentiana
|authority=Weatherby
|rank=variety
|publication_title=Rhodora
|publication_place=28: 129. 1926
}}
|synonyms=
|hierarchy=Dryopteridaceae;Cystopteris;Cystopteris laurentiana
|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 laurentiana]]</div></div>
|volume=Volume 2
|mention_page=
|treatment_page=
}}<!--

--><span class="statement" id="st-undefined" data-properties=""><b>Stems </b>creeping, not cordlike, internodes very short, less than 5 mm, heavily beset with old petiole bases, hairs absent; scales uniformly brown to ± clathrate, radial walls brown, luminae clear. <b>Leaves</b> monomorphic, clustered at stem apex, to 45 cm, nearly all bearing sori. <b>Petiole</b> usually dark at base, grading to straw-colored distally, shorter than blade, sparsely scaly at base. <b>Blade</b> ovate to narrowly ovate, 2-pinnate to 2-pinnate-pinnatifid, widest above base, apex short-attenuate; rachis and costae usually sparsely invested with unicellular, gland-tipped hairs, occasionally with misshapen bulblets; axils of pinnae with occasional multicellular, gland-tipped hairs. <b>Pinnae</b> typically perpendicular to rachis, not curving toward blade apex, margins serrate; proximal pinnae pinnate-pinnatifid to pinnatifid, ± equilateral, basiscopic pinnules not enlarged, basal basiscopic pinnules sessile to short-stalked, base truncate to obtuse; distal pinnae ovate to oblong. <b>Veins</b> directed into teeth and notches. <b>Indusia</b> cup-shaped, apex truncate, typically sparsely invested with unicellular, gland-tipped hairs. <b>Spores</b> spiny, usually 49–60 µm. <b>2n</b> = 252.</span><!--

-->{{Treatment/Body
|phenology=Sporulating summer–fall.
|habitat=Cracks and ledges on cliffs, often on calcareous substrates
|elevation=0–1000 m
|distribution=N.B.;Nfld.;N.S.;Ont.;Que.;Conn.;Ill.;Iowa;Mass.;Mich.;Minn.;Pa.;Vt.;Wis.
|discussion=<p><i>Cystopteris laurentiana</i> is a sexual allohexaploid species with <i>C. bulbifera</i> as the diploid parent and <i>C. fragilis</i> as the tetraploid. <i>Cystopteris laurentiana</i> was previously thought to be common only in the Great Lakes region (R. F. Blasdell 1963); it is now known to occur frequently in the Driftless Area of the Midwest. Because <i>C. laurentiana</i> can be difficult to distinguish from <i>C. fragilis</i>, specimens with ovate leaves having unusually large spores and growing on moist cliffs should be checked carefully for occasional glandular hairs, the distinguishing feature of <i>C. laurentiana</i>. Sterile pentaploid hybrids between <i>C. laurentiana</i> and <i>C. fragilis</i> have been discovered where the two species are sympatric.</p>
|tables=
|references=
}}<!--

--><!--

-->{{#Taxon:
name=Cystopteris laurentiana
|authority=(Weatherby) Blasdell
|rank=species
|parent rank=genus
|synonyms=
|basionyms=Cystopteris fragilis var. laurentiana
|family=Dryopteridaceae
|phenology=Sporulating summer–fall.
|habitat=Cracks and ledges on cliffs, often on calcareous substrates
|elevation=0–1000 m
|distribution=N.B.;Nfld.;N.S.;Ont.;Que.;Conn.;Ill.;Iowa;Mass.;Mich.;Minn.;Pa.;Vt.;Wis.
|reference=None
|publication title=Mem. Torrey Bot. Club
|publication year=1963
|special status=
|source xml=https://jpend@bitbucket.org/aafc-mbb/fna-data-curation.git/src/f50eec43f223ca0e34566be0b046453a0960e173/coarse_grained_fna_xml/V2/V2_397.xml
|genus=Cystopteris
|species=Cystopteris laurentiana
}}<!--

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