Difference between revisions of "Isoëtes lacustris"
Sp. Pl. 2: 1100. 1753.
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| − | --><span class="statement" id="st- | + | --><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><!-- |
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| + | |phenology=Spores mature late summer. | ||
|habitat=Cool, oligotrophic, slightly acidic lakes and streams | |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. | |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. | ||
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|basionyms= | |basionyms= | ||
|family=Isoëtaceae | |family=Isoëtaceae | ||
| + | |phenology=Spores mature late summer. | ||
|habitat=Cool, oligotrophic, slightly acidic lakes and streams | |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. | |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. | ||
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|publication year=1753 | |publication year=1753 | ||
|special status= | |special status= | ||
| − | |source xml=https://jpend@bitbucket.org/aafc-mbb/fna- | + | |source xml=https://jpend@bitbucket.org/aafc-mbb/fna-data-curation.git/src/9216fc802291cd3df363fd52122300479582ede7/coarse_grained_fna_xml/V2/V2_398.xml |
|genus=Isoëtes | |genus=Isoëtes | ||
|species=Isoëtes lacustris | |species=Isoëtes lacustris | ||
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Revision as of 14:19, 27 July 2019
Plants aquatic, submerged. Rootstock nearly globose, 2-lobed. Leaves evergreen, dark green to reddish green, pala brown toward base, spirally arranged, to 25 cm, rigid, abruptly tapering to tip. Velum covering less than 1/2 of sporangium. Sporangium wall ± brown-streaked. Megaspores white, 55–750 μm diam., cristate to reticulate with branching to anastomosing ridges; girdle densely papillate or rarely smooth. Microspores gray in mass, 33–45 μm, paillose. 2n = 110.
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
Population of Isoëtes lacustris in Tennessee and Virginia are disjunct.
North American plants of Isoëtes lacustris 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.
Isoëtes lacustris 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].
Isoëtes lacustris hibridizes with I. echinospora [ = I. x hickeyi W. C. Taylor & Luebke]; I. engelmannii; I. riparia [ = I. x jeffreyi D. M. Britton & Brunton]; and with I. tuckermanii [ = I. x harveyi A. A. Eaton].
Selected References
None.