View source for Isoëtes lacustris

{{Treatment/ID
|accepted_name=Isoëtes lacustris
|accepted_authority=Linnaeus
|publications={{Treatment/Publication
|title=Sp. Pl.
|place=2: 1100. 1753
|year=1753
}}
|common_names=Lake quillwort;isoète lacustre
|basionyms=
|synonyms={{Treatment/ID/Synonym
|name=Isoëtes hieroglyphica
|authority=A. A. Eaton
}} {{Treatment/ID/Synonym
|name=Isoëtes macrospora
|authority=Durieu
}}
|hierarchy=Isoëtaceae;Isoëtes;Isoëtes lacustris
|hierarchy_nav=<div class="higher-taxa"><div class="higher-taxon"><small>family</small>[[Isoëtaceae]]</div><div class="higher-taxon"><small>genus</small>[[Isoëtes]]</div><div class="higher-taxon"><small>species</small>[[Isoëtes lacustris]]</div></div>
|volume=Volume 2
|mention_page=
|treatment_page=
}}<!--

--><span class="statement" id="st-undefined" data-properties=""><b>Plants </b>aquatic, submerged. <b>Rootstock</b> nearly globose, 2-lobed. <b>Leaves</b> evergreen, dark green to reddish green, pala brown toward base, spirally arranged, to 25 cm, rigid, abruptly tapering to tip. <b>Velum</b> covering less than 1/2 of sporangium. <b>Sporangium</b> wall ± brown-streaked. <b>Megaspores</b> white, 55–750 μm diam., cristate to reticulate with branching to anastomosing ridges; girdle densely papillate or rarely smooth. <b>Microspores</b> gray in mass, 33–45 μm, paillose. <b>2n</b> = 110.</span><!--

-->{{Treatment/Body
|phenology=Spores mature late summer.
|habitat=Cool, oligotrophic, slightly acidic lakes and streams
|distribution=Greenland;Man.;N.B.;Nfld.;N.S.;Ont.;P.E.I. Que.;Sask.;Conn.;Maine;Mass.;Mich.;Minn.;N.H.;N.Y.;R.I.;Tenn.;Vt.;Va.;Wis.;n;c Europe.
|discussion=<p>Population of <i>Isoëtes lacustris</i> in Tennessee and Virginia are disjunct.</p><!--
--><p>North American plants of <i>Isoëtes lacustris</i> have been segregated as I. macrospora; both taxa are decaploids (2n = 110) and have similar leaf and spore morphology. Then cannot reliably be distinguished from each other except on the basis of geography.</p><!--
--><p><i>Isoëtes lacustris</i> is a totally submerged aquatic. Plants have been found at depths of more than 3 m. Plants with rugulate megaspores bearing smooth, rounded ridges and a smooth girdle have been called I. hieroglyphica A. A. Eaton [I. macrospora f. hieroglyphica (A. A. Eaton) N. E. Pfeiffer].</p><!--
--><p><i>Isoëtes lacustris</i> hibridizes with <i>I. echinospora</i> [ = I. x hickeyi W. C. Taylor & Luebke]; <i>I. engelmannii</i>; <i>I. riparia</i> [ = I. x jeffreyi D. M. Britton & Brunton]; and with <i>I. tuckermanii</i> [ = I. x harveyi A. A. Eaton].</p>
|tables=
|references=
}}<!--

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-->{{#Taxon:
name=Isoëtes lacustris
|author=
|authority=Linnaeus
|rank=species
|parent rank=genus
|synonyms=Isoëtes hieroglyphica;Isoëtes macrospora
|basionyms=
|family=Isoëtaceae
|phenology=Spores mature late summer.
|habitat=Cool, oligotrophic, slightly acidic lakes and streams
|distribution=Greenland;Man.;N.B.;Nfld.;N.S.;Ont.;P.E.I. Que.;Sask.;Conn.;Maine;Mass.;Mich.;Minn.;N.H.;N.Y.;R.I.;Tenn.;Vt.;Va.;Wis.;n;c Europe.
|reference=None
|publication title=Sp. Pl.
|publication year=1753
|special status=
|source xml=https://jpend@bitbucket.org/aafc-mbb/fna-data-curation.git/src/f6b125a955440c0872999024f038d74684f65921/coarse_grained_fna_xml/V2/V2_398.xml
|genus=Isoëtes
|species=Isoëtes lacustris
}}<!--

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