Difference between revisions of "Isoëtes louisianensis"
Sida 5: 129. 1973.
Common names: Louisiana quillwort
Treatment appears in FNA Volume 2.
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| − | --><span class="statement" id="st- | + | --><span class="statement" id="st-undefined" data-properties=""><b>Plants </b>aquatic, emergent. <b>Rootstock</b> nearly globose, 2-lobed. <b>Leaves</b> evergreen, bright green, pale toward base, spirally arranged to 40 cm, pliant, gradually tapering to tip. <b>Velum</b> covering less than 1/2 of sporangium. <b>Sporangium</b> wall brown-streaked. <b>Megaspores</b> white, 500–625 μm diam., cristate with thick ridges; girdle obscure. <b>Microspores</b> brown in mass, 25–35 μm, spinulose. <b>2n</b> = 44.</span><!-- |
-->{{Treatment/Body | -->{{Treatment/Body | ||
| + | |phenology=Spores mature winter–early spring. | ||
|habitat=Creeks | |habitat=Creeks | ||
|distribution=La. | |distribution=La. | ||
| − | |discussion=<p>Isoëtes louisianensis is known from drainage streams in St. Tammany and Washington parishes in southeastern Louisiana. Based on the reticulate texture of the megaspore, it is possible that I. louisianensis represents an allotetraploid with I. engelmannii as one of its parents. Isoëtes louisianensis may represent I. engelmannii x melanopoda (B. M. Boom 1982). Spores are uniform in size and texture and readily germinate in culture.</p><!-- | + | |discussion=<p><i>Isoëtes louisianensis</i> is known from drainage streams in St. Tammany and Washington parishes in southeastern Louisiana. Based on the reticulate texture of the megaspore, it is possible that <i>I. louisianensis</i> represents an allotetraploid with <i>I. engelmannii</i> as one of its parents. <i>Isoëtes louisianensis</i> may represent <i>I. engelmannii</i> x melanopoda (B. M. Boom 1982). Spores are uniform in size and texture and readily germinate in culture.</p><!-- |
--><p>Of conservation concern.</p> | --><p>Of conservation concern.</p> | ||
|tables= | |tables= | ||
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name=Isoëtes louisianensis | name=Isoëtes louisianensis | ||
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|authority=Thieret | |authority=Thieret | ||
|rank=species | |rank=species | ||
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|basionyms= | |basionyms= | ||
|family=Isoëtaceae | |family=Isoëtaceae | ||
| + | |phenology=Spores mature winter–early spring. | ||
|habitat=Creeks | |habitat=Creeks | ||
|distribution=La. | |distribution=La. | ||
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|publication year=1973 | |publication year=1973 | ||
|special status= | |special status= | ||
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|genus=Isoëtes | |genus=Isoëtes | ||
|species=Isoëtes louisianensis | |species=Isoëtes louisianensis | ||
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Latest revision as of 21:23, 5 November 2020
Plants aquatic, emergent. Rootstock nearly globose, 2-lobed. Leaves evergreen, bright green, pale toward base, spirally arranged to 40 cm, pliant, gradually tapering to tip. Velum covering less than 1/2 of sporangium. Sporangium wall brown-streaked. Megaspores white, 500–625 μm diam., cristate with thick ridges; girdle obscure. Microspores brown in mass, 25–35 μm, spinulose. 2n = 44.
Phenology: Spores mature winter–early spring.
Habitat: Creeks
Discussion
Isoëtes louisianensis is known from drainage streams in St. Tammany and Washington parishes in southeastern Louisiana. Based on the reticulate texture of the megaspore, it is possible that I. louisianensis represents an allotetraploid with I. engelmannii as one of its parents. Isoëtes louisianensis may represent I. engelmannii x melanopoda (B. M. Boom 1982). Spores are uniform in size and texture and readily germinate in culture.
Of conservation concern.
Selected References
None.
Lower Taxa
None.