Difference between revisions of "Isoëtes howellii"
Trans. Acad. Sci. St. Louis 4: 385. 1882.
Common names: Howell's quillwort
Synonyms: Isoëtes melanopoda var. californica A. A. Eaton Isoëtes minima A. A. Eaton Isoëtes nuda Engelmann Isoëtes underwoodii L. F. Henderson
Treatment appears in FNA Volume 2.
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|name=Isoëtes melanopoda var. californica | |name=Isoëtes melanopoda var. californica | ||
|authority=A. A. Eaton | |authority=A. A. Eaton | ||
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|name=Isoëtes minima | |name=Isoëtes minima | ||
|authority=A. A. Eaton | |authority=A. A. Eaton | ||
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|name=Isoëtes nuda | |name=Isoëtes nuda | ||
|authority=Engelmann | |authority=Engelmann | ||
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|name=Isoëtes underwoodii | |name=Isoëtes underwoodii | ||
|authority=L. F. Henderson | |authority=L. F. Henderson | ||
| + | |rank=species | ||
}} | }} | ||
|hierarchy=Isoëtaceae;Isoëtes;Isoëtes howellii | |hierarchy=Isoëtaceae;Isoëtes;Isoëtes howellii | ||
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| − | --><span class="statement" id="st- | + | --><span class="statement" id="st-undefined" data-properties=""><b>Plants </b>becoming terrestrial. <b>Rootstock</b> nearly globose, 2-lobed. <b>Leaves</b> deciduous, bright green, pale to brown or lustrous black toward base, spirally arranged, to 25 cm, pliant, gradually tapering to tip. <b>Velum</b> covering less than 1/2 of sporangium. <b>Sporangium</b> wall brown-streaked to completely brown. <b>Megaspores</b> white, 300–500 μm diam., obscurely tuberculate to rugulate; girdle smooth. <b>Microspores</b> brown in mass, 25–35 μm, spinulose. <b>2n</b> = 22.</span><!-- |
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| + | |phenology=Spores mature in late spring and summer. | ||
|habitat=Wet depressions, vernal pools, and lake margins | |habitat=Wet depressions, vernal pools, and lake margins | ||
|distribution=B.C.;Calif.;Idaho;Mont.;Oreg.;Wash. | |distribution=B.C.;Calif.;Idaho;Mont.;Oreg.;Wash. | ||
| − | |discussion=<p>In many respects, Isoëtes howellii appears similar to I. melanopoda. Small plants with leaves less than 10 cm and megaspores less than 420 μm diam. have been called I. howellii var. minima (A. A. Eaton) N. E. Pfeiffer.</p> | + | |discussion=<p>In many respects, <i>Isoëtes howellii</i> appears similar to <i>I. melanopoda</i>. Small plants with leaves less than 10 cm and megaspores less than 420 μm diam. have been called <i>I. howellii</i> <i></i>var.<i> minima</i> (A. A. Eaton) N. E. Pfeiffer.</p> |
|tables= | |tables= | ||
|references= | |references= | ||
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name=Isoëtes howellii | name=Isoëtes howellii | ||
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|authority=Engelmann | |authority=Engelmann | ||
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|basionyms= | |basionyms= | ||
|family=Isoëtaceae | |family=Isoëtaceae | ||
| + | |phenology=Spores mature in late spring and summer. | ||
|habitat=Wet depressions, vernal pools, and lake margins | |habitat=Wet depressions, vernal pools, and lake margins | ||
|distribution=B.C.;Calif.;Idaho;Mont.;Oreg.;Wash. | |distribution=B.C.;Calif.;Idaho;Mont.;Oreg.;Wash. | ||
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|publication year=1882 | |publication year=1882 | ||
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|genus=Isoëtes | |genus=Isoëtes | ||
|species=Isoëtes howellii | |species=Isoëtes howellii | ||
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-->[[Category:Treatment]][[Category:Isoëtes]] | -->[[Category:Treatment]][[Category:Isoëtes]] | ||
Latest revision as of 20:23, 5 November 2020
Plants becoming terrestrial. Rootstock nearly globose, 2-lobed. Leaves deciduous, bright green, pale to brown or lustrous black toward base, spirally arranged, to 25 cm, pliant, gradually tapering to tip. Velum covering less than 1/2 of sporangium. Sporangium wall brown-streaked to completely brown. Megaspores white, 300–500 μm diam., obscurely tuberculate to rugulate; girdle smooth. Microspores brown in mass, 25–35 μm, spinulose. 2n = 22.
Phenology: Spores mature in late spring and summer.
Habitat: Wet depressions, vernal pools, and lake margins
Distribution
B.C., Calif., Idaho, Mont., Oreg., Wash.
Discussion
In many respects, Isoëtes howellii appears similar to I. melanopoda. Small plants with leaves less than 10 cm and megaspores less than 420 μm diam. have been called I. howellii var. minima (A. A. Eaton) N. E. Pfeiffer.
Selected References
None.
Lower Taxa
None.