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Shore Quillwort

Isoetes riparia Engelm. ex A. Br.

Brief Summary

    Isoetes riparia: Brief Summary
    provided by wikipedia

    Isoetes riparia (shore quillwort) is a species of quillwort in the Isoetaceae family. It can be found in rivers, creeks, and tidal mud flats in southern Quebec and southeastern Ontario, south to eastern New York. It has 5 to 35 long, erect bright green to yellow-green leaves, which are 6 to 35 centimeters long. The velum covers one fourth of the sporangium, which can be 7 millimeters long and 4 millimeters wide. The elongated ligule can grow to be 3 millimeters long. The spherical megaspores are 430 to 680 micrometers in diameter with closely set ridges. The kidney-shaped microspores are 24-35 micrometers long, and usually have spine-tipped tubercules. The megaspores can sometimes come to resemble that of either I. echinospora, if the megaspores become eroded and bear projections that could resemble spines, or I. macrospora, if the broken ridges take a certain shape.

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Comprehensive Description

    Isoetes riparia
    provided by wikipedia

    Isoetes riparia (shore quillwort)[1] is a species of quillwort in the Isoetaceae family. It can be found in rivers, creeks, and tidal mud flats in southern Quebec and southeastern Ontario, south to eastern New York.[2] It has 5 to 35 long, erect bright green to yellow-green leaves, which are 6 to 35 centimeters long. The velum covers one fourth of the sporangium, which can be 7 millimeters long and 4 millimeters wide. The elongated ligule can grow to be 3 millimeters long. The spherical megaspores are 430 to 680 micrometers in diameter with closely set ridges. The kidney-shaped microspores are 24-35 micrometers long, and usually have spine-tipped tubercules. The megaspores can sometimes come to resemble that of either I. echinospora, if the megaspores become eroded and bear projections that could resemble spines, or I. macrospora, if the broken ridges take a certain shape.[2]

    References

    1. ^ "Isoetes ripara". Natural Resources Conservation Service PLANTS Database. USDA. Retrieved 26 May 2015..mw-parser-output cite.citation{font-style:inherit}.mw-parser-output q{quotes:"""""'"'"}.mw-parser-output code.cs1-code{color:inherit;background:inherit;border:inherit;padding:inherit}.mw-parser-output .cs1-lock-free a{background:url("//upload.wikimedia.org/wikipedia/commons/thumb/6/65/Lock-green.svg/9px-Lock-green.svg.png")no-repeat;background-position:right .1em center}.mw-parser-output .cs1-lock-limited a,.mw-parser-output .cs1-lock-registration a{background:url("//upload.wikimedia.org/wikipedia/commons/thumb/d/d6/Lock-gray-alt-2.svg/9px-Lock-gray-alt-2.svg.png")no-repeat;background-position:right .1em center}.mw-parser-output .cs1-lock-subscription a{background:url("//upload.wikimedia.org/wikipedia/commons/thumb/a/aa/Lock-red-alt-2.svg/9px-Lock-red-alt-2.svg.png")no-repeat;background-position:right .1em center}.mw-parser-output .cs1-subscription,.mw-parser-output .cs1-registration{color:#555}.mw-parser-output .cs1-subscription span,.mw-parser-output .cs1-registration span{border-bottom:1px dotted;cursor:help}.mw-parser-output .cs1-hidden-error{display:none;font-size:100%}.mw-parser-output .cs1-visible-error{font-size:100%}.mw-parser-output .cs1-subscription,.mw-parser-output .cs1-registration,.mw-parser-output .cs1-format{font-size:95%}.mw-parser-output .cs1-kern-left,.mw-parser-output .cs1-kern-wl-left{padding-left:0.2em}.mw-parser-output .cs1-kern-right,.mw-parser-output .cs1-kern-wl-right{padding-right:0.2em}
    2. ^ a b Cody, William; Britton, Donald (1989). Ferns and Fern Allies of Canada. Agriculture Canada.


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Morphology

    Comments
    provided by eFloras
    Megaspore morphology, electrophoretic profiles of leaf enzymes, and chromosome number provide evidence that Isoëtes riparia is an allotetraploid, formed by chromosome doubling in I. x eatonii, the primary diploid hybrid between I. echinospora and I. engelmanii. The considerable variation in leaf and spore morphology possibly results from multiple allotetraploid origins.

    Isoëtes riparia hybridizes with I. echinospora [ = I. x dodgei A. A. Eaton]; I. engelmannii [ = I. x brittonii Brunton & W. C. Taylor]; I. lacustris [ = I. x jeffreyi D. M. Britton & Brunton); and I. tuckermanii.

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    Missouri Botanical Garden, 4344 Shaw Boulevard, St. Louis, MO, 63110 USA
    bibliographic citation
    Flora of North America Vol. 2 in eFloras.org, Missouri Botanical Garden. Accessed Nov 12, 2008.
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    Flora of North America @ eFloras.org
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    Flora of North America Editorial Committee
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    262433
    Description
    provided by eFloras
    Plants usually aquatic, occasionally emergent. Rootstock nearly globose, 2-lobed. Leaves evergreen, bright green, pale toward base, spirally arranged, often twisted, to 35(--50) cm, pliant, gradually tapering to tip. Velum covering less than 1/2 of sporangium. Sporangium wall brown-streaked to completely brown. Megaspores white, 450-650 μm diam., cristate with isolated and branching, lamellate ridges; girdle obscure. Microspores gray to light brown in mass, 30--40 μm, tuberculate. 2n = 44.
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    cc-by-nc-sa-3.0
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    Missouri Botanical Garden, 4344 Shaw Boulevard, St. Louis, MO, 63110 USA
    bibliographic citation
    Flora of North America Vol. 2 in eFloras.org, Missouri Botanical Garden. Accessed Nov 12, 2008.
    source
    Flora of North America @ eFloras.org
    editor
    Flora of North America Editorial Committee
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    eFloras.org
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    eFloras
    ID
    262434

Diagnostic Description

    Synonym
    provided by eFloras
    Isoëtes canadensis (Engelmann) A. A. Eaton; I. saccharata Engelmann
    license
    cc-by-nc-sa-3.0
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    Missouri Botanical Garden, 4344 Shaw Boulevard, St. Louis, MO, 63110 USA
    bibliographic citation
    Flora of North America Vol. 2 in eFloras.org, Missouri Botanical Garden. Accessed Nov 12, 2008.
    source
    Flora of North America @ eFloras.org
    editor
    Flora of North America Editorial Committee
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    eFloras.org
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    eFloras
    ID
    262436

Habitat

    Habitat & Distribution
    provided by eFloras
    Spores mature late summer. Margins of lakes, ponds, and streams; tidal shores and estuaries; calcareous to slightly acidic substrates in fresh, usually oligotrophic, water; Ont., Que.; Conn., Del., Fla., Maine, Md., Mass., N.H., N.J., N.Y., N.C., Pa., R.I., S.C., Vt., Va., W. Va.
    license
    cc-by-nc-sa-3.0
    copyright
    Missouri Botanical Garden, 4344 Shaw Boulevard, St. Louis, MO, 63110 USA
    bibliographic citation
    Flora of North America Vol. 2 in eFloras.org, Missouri Botanical Garden. Accessed Nov 12, 2008.
    source
    Flora of North America @ eFloras.org
    editor
    Flora of North America Editorial Committee
    project
    eFloras.org
    original
    visit source
    partner site
    eFloras
    ID
    262435