View source for Gymnocarpium robertianum

{{Treatment/ID
|accepted_name=Gymnocarpium robertianum
|accepted_authority=(Hoffmann) Newman
|publications={{Treatment/Publication
|title=Phytologist
|place=4: app. 24. 1851
|year=1851
}}
|common_names=Limestone oak fern;gymnocarpe de robert
|basionyms={{Treatment/ID/Synonym
|name=Polypodium robertianum
|authority=Hoffmann
}}
|synonyms={{Treatment/ID/Synonym
|name=Dryopteris robertiana
|authority=(Hoffmann) C. Christensen
}} {{Treatment/ID/Synonym
|name=Phegopteris robertianum
|authority=(Hoffmann) Fée
}} {{Treatment/ID/Synonym
|name=Thelypteris robertiana
|authority=(Hoffmann) Slosson
}}
|hierarchy=Dryopteridaceae;Gymnocarpium;Gymnocarpium robertianum
|hierarchy_nav=<div class="higher-taxa"><div class="higher-taxon"><small>family</small>[[Dryopteridaceae]]</div><div class="higher-taxon"><small>genus</small>[[Gymnocarpium]]</div><div class="higher-taxon"><small>species</small>[[Gymnocarpium robertianum]]</div></div>
|volume=Volume 2
|mention_page=
|treatment_page=
}}<!--

--><span class="statement" id="st-undefined" data-properties=""><b>Stems </b>1–2 mm diam.; scales 2–4 mm. <b>Fertile</b> leaves usually 10–52 cm. <b>Petiole</b> 5–33 cm, with numerous glandular hairs distally; scales 2–6 mm. <b>Blade</b> broadly deltate, 2–3-pinnate-pinnatifid, 5–19 cm, usually firm and robust, abaxial surface moderately to densely glandular, rachis densely glandular, adaxial surface moderately glandular. <b>Pinna</b> apex acute. <b>Proximal</b> pinnae 3–13 cm, ± perpendicular to rachis, basiscopic pinnules ± perpendicular to costa; basal basiscopic pinnules either sessile or stalked, pinnate-pinnatifid or pinnatifid, if sessile then with basal basiscopic pinnulet usually shorter than adjacent pinnulet; 2d basal basiscopic pinnule sometimes stalked, if sessile then with basal basiscopic pinnulet shorter than or equaling adjacent pinnulet; basal acroscopic pinnule sometimes stalked, if sessile then with basal basiscopic pinnulet shorter than or equaling adjacent pinnulet. <b>Pinnae</b> of 2d pair usually stalked, if sessile then with basal basiscopic pinnule usually shorter than adjacent pinnule and equaling basal acroscopic pinnule; basal acroscopic pinnule shorter than adjacent pinnule, apex often entire, rounded. <b>Pinnae</b> of 3d pair usually sessile with basal basiscopic pinnule shorter than adjacent pinnule and equaling basal acroscopic pinnule; basal acroscopic pinnule equaling or shorter than adjacent pinnule. <b>Ultimate</b> segments of proximal pinnae oblong, entire to slightly crenate, apex entire, rounded. <b>Spores</b> 34–39 µm. <b>2n</b> = 160.</span><!--

-->{{Treatment/Body
|habitat=Calcareous substrates, limestone pavement, outcrops, and cliffs, Thuja swamps
|elevation=0–1000 m
|distribution=Man.;N.B.;Nfld.;Ont.;Que.;Iowa;Mich.;Minn.;Wis.;Europe;Asia in Caucasus Mountains.
|discussion=<p><i>Gymnocarpium robertianum</i> occurs in numerous localities in eastern Canada, especially in Ontario and Quebec where it is widely distributed; populations are small. Hybrids with <i>G. robertianum</i> are extremely rare. <i>Gymnocarpium</i> × heterosporum W. H. Wagner, a putative triploid hybrid between <i>G. robertianum</i> and <i>G. appalachianum</i>, is known only from one county in Pennsylvania (plants now extirpated, K. M. Pryer 1992). <i>Gymnocarpium</i> × achriosporum Sarvela, a putative tetraploid hybrid between <i>G. robertianum</i> and <i>G. dryopteris</i>, is known only from Sweden and two localities in Quebec. Both hybrids resemble <i>G. robertianum</i> in their leaf morphology and dense glandularity but have black, malformed spores.</p>
|tables=
|references=
}}<!--

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-->{{#Taxon:
name=Gymnocarpium robertianum
|author=
|authority=(Hoffmann) Newman
|rank=species
|parent rank=genus
|synonyms=Dryopteris robertiana;Phegopteris robertianum;Thelypteris robertiana
|basionyms=Polypodium robertianum
|family=Dryopteridaceae
|habitat=Calcareous substrates, limestone pavement, outcrops, and cliffs, Thuja swamps
|elevation=0–1000 m
|distribution=Man.;N.B.;Nfld.;Ont.;Que.;Iowa;Mich.;Minn.;Wis.;Europe;Asia in Caucasus Mountains.
|reference=None
|publication title=Phytologist
|publication year=1851
|special status=
|source xml=https://jpend@bitbucket.org/aafc-mbb/fna-data-curation.git/src/8f726806613d60c220dc4493de13607dd3150896/coarse_grained_fna_xml/V2/V2_42.xml
|genus=Gymnocarpium
|species=Gymnocarpium robertianum
}}<!--

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