Difference between revisions of "Isoëtes lacustris"
Sp. Pl. 2: 1100. 1753.
FNA>Volume Importer |
FNA>Volume Importer |
||
| Line 12: | Line 12: | ||
|name=Isoëtes hieroglyphica | |name=Isoëtes hieroglyphica | ||
|authority=A. A. Eaton | |authority=A. A. Eaton | ||
| − | }}{{Treatment/ID/Synonym | + | }} {{Treatment/ID/Synonym |
|name=Isoëtes macrospora | |name=Isoëtes macrospora | ||
|authority=Durieu | |authority=Durieu | ||
| Line 29: | Line 29: | ||
|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. | ||
| − | |discussion=<p>Population of Isoëtes lacustris 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 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.</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>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].</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>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].</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= | |tables= | ||
|references= | |references= | ||
| Line 55: | Line 55: | ||
|publication year=1753 | |publication year=1753 | ||
|special status= | |special status= | ||
| − | |source xml=https://jpend@bitbucket.org/aafc-mbb/fna-data-curation.git/src/ | + | |source xml=https://jpend@bitbucket.org/aafc-mbb/fna-data-curation.git/src/8f726806613d60c220dc4493de13607dd3150896/coarse_grained_fna_xml/V2/V2_398.xml |
|genus=Isoëtes | |genus=Isoëtes | ||
|species=Isoëtes lacustris | |species=Isoëtes lacustris | ||
Revision as of 15:47, 18 September 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.