Difference between revisions of "Isoëtes lacustris"
Sp. Pl. 2: 1100. 1753.
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|phenology=Spores mature late summer. | |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. and Labr. (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><!-- | |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>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><!-- | ||
| Line 51: | Line 51: | ||
|phenology=Spores mature late summer. | |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. and Labr. (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 | |reference=None | ||
|publication title=Sp. Pl. | |publication title=Sp. Pl. | ||
|publication year=1753 | |publication year=1753 | ||
|special status= | |special status= | ||
| − | |source xml=https:// | + | |source xml=https://bibilujan@bitbucket.org/aafc-mbb/fna-data-curation.git/src/bb6b7e3a7de7d3b7888a1ad48c7fd8f5c722d8d6/coarse_grained_fna_xml/V2/V2_398.xml |
|genus=Isoëtes | |genus=Isoëtes | ||
|species=Isoëtes lacustris | |species=Isoëtes lacustris | ||
Revision as of 21:12, 27 May 2020
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. and Labr. (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.