Difference between revisions of "Isoëtes engelmannii"

A. Braun

Flora 29: 178. 1846.

Common names: Engelmann's quillwort
Synonyms: Isoëtes valida (Engelmann) Clute
Treatment appears in FNA Volume 2.
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--><span class="statement" id="st-d0_s0" data-properties="plant growth form or habitat;plant location"><b>Plants </b>aquatic, emergent.</span> <span class="statement" id="st-d0_s1" data-properties="rootstock shape;rootstock shape"><b>Rootstock </b>nearly globose, 2-lobed.</span> <span class="statement" id="st-d0_s2" data-properties="leaf duration;leaf coloration;leaf coloration;leaf arrangement;leaf atypical some measurement;leaf some measurement;leaf texture;leaf shape"><b>Leaves </b>evergreen, bright green, pale toward base, spirally arranged, to 60 (–90) cm, pliant, gradually tapering to tip.</span> <span class="statement" id="st-d0_s3" data-properties="velum position relational;velum count"><b>Velum </b>covering less than 1/4 of sporangium.</span> <span class="statement" id="st-d0_s4" data-properties="sporangium wall coloration;sporangium wall coloration"><b>Sporangium </b>wall usually unpigmented, occasionally ± brown-streaked.</span> <span class="statement" id="st-d0_s5" data-properties="megaspore coloration;megaspore diameter;megaspore architecture or coloration or relief;ridge condition;ridge shape"><b>Megaspores </b>white, 400–560 μm diam., reticulate, with unbroken lamellate ridges;</span> <span class="statement" id="st-d0_s6" data-properties="girdle prominence">girdle obscure.</span> <span class="statement" id="st-d0_s7" data-properties=""><b>Microspores </b>gray in mass, 20–30 μm, smooth to papillose.</span> <span class="statement" id="st-d0_s8" data-properties="microspore coloration;microspore some measurement;microspore relief;microspore relief;microspore relief;2n chromosome count">2n = 22.</span><!--
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--><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 60(–90) cm, pliant, gradually tapering to tip. <b>Velum</b> covering less than 1/4 of sporangium. <b>Sporangium</b> wall usually unpigmented, occasionally ± brown-streaked. <b>Megaspores</b> white, 400–560 μm diam., reticulate, with unbroken lamellate ridges; girdle obscure. <b>Microspores</b> gray in mass, 20–30 μm, smooth to papillose. <b>2n</b> = 22.</span><!--
  
 
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|phenology=Spores mature in summer.
 
|habitat=Emergent or in shallow water of lakes, ponds, streams, and ditches
 
|habitat=Emergent or in shallow water of lakes, ponds, streams, and ditches
 
|distribution=Ont.;Ala.;Ark.;Conn.;Del.;Fla.;Ga.;Ill.;Ind.;Ky.;Md.;Mass.;Mich.;Mo.;N.H.;N.J.;N.Y.;N.C.;Ohio;Pa.;R.I.;S.C.;Tenn.;Vt.;Va.;W.Va.
 
|distribution=Ont.;Ala.;Ark.;Conn.;Del.;Fla.;Ga.;Ill.;Ind.;Ky.;Md.;Mass.;Mich.;Mo.;N.H.;N.J.;N.Y.;N.C.;Ohio;Pa.;R.I.;S.C.;Tenn.;Vt.;Va.;W.Va.
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|basionyms=
 
|basionyms=
 
|family=Isoëtaceae
 
|family=Isoëtaceae
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|phenology=Spores mature in summer.
 
|habitat=Emergent or in shallow water of lakes, ponds, streams, and ditches
 
|habitat=Emergent or in shallow water of lakes, ponds, streams, and ditches
 
|distribution=Ont.;Ala.;Ark.;Conn.;Del.;Fla.;Ga.;Ill.;Ind.;Ky.;Md.;Mass.;Mich.;Mo.;N.H.;N.J.;N.Y.;N.C.;Ohio;Pa.;R.I.;S.C.;Tenn.;Vt.;Va.;W.Va.
 
|distribution=Ont.;Ala.;Ark.;Conn.;Del.;Fla.;Ga.;Ill.;Ind.;Ky.;Md.;Mass.;Mich.;Mo.;N.H.;N.J.;N.Y.;N.C.;Ohio;Pa.;R.I.;S.C.;Tenn.;Vt.;Va.;W.Va.
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|publication year=1846
 
|publication year=1846
 
|special status=
 
|special status=
|source xml=https://jpend@bitbucket.org/aafc-mbb/fna-fine-grained-xml.git/src/287ef3db526bd807d435a3c7423ef2df1e951227/V2/V2_513.xml
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|source xml=https://jpend@bitbucket.org/aafc-mbb/fna-data-curation.git/src/9216fc802291cd3df363fd52122300479582ede7/coarse_grained_fna_xml/V2/V2_513.xml
 
|genus=Isoëtes
 
|genus=Isoëtes
 
|species=Isoëtes engelmannii
 
|species=Isoëtes engelmannii
|2n chromosome count=22
 
|girdle prominence=obscure
 
|leaf arrangement=arranged
 
|leaf atypical some measurement=60cm;90cm
 
|leaf coloration=pale;bright green
 
|leaf duration=evergreen
 
|leaf shape=tapering
 
|leaf some measurement=0cm;60cm
 
|leaf texture=pliant
 
|megaspore architecture or coloration or relief=reticulate
 
|megaspore coloration=white
 
|megaspore diameter=400um;560um
 
|microspore coloration=gray
 
|microspore relief=smooth;papillose
 
|microspore some measurement=20um;30um
 
|plant growth form or habitat=aquatic
 
|plant location=emergent
 
|ridge condition=unbroken
 
|ridge shape=lamellate
 
|rootstock shape=2-lobed;globose
 
|sporangium wall coloration=brown-streaked;unpigmented
 
|velum count=0;1/4
 
|velum position relational=covering
 
 
}}<!--
 
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-->[[Category:Treatment]][[Category:Isoëtes]]

Revision as of 13:22, 27 July 2019

Plants aquatic, emergent. Rootstock nearly globose, 2-lobed. Leaves evergreen, bright green, pale toward base, spirally arranged, to 60(–90) cm, pliant, gradually tapering to tip. Velum covering less than 1/4 of sporangium. Sporangium wall usually unpigmented, occasionally ± brown-streaked. Megaspores white, 400–560 μm diam., reticulate, with unbroken lamellate ridges; girdle obscure. Microspores gray in mass, 20–30 μm, smooth to papillose. 2n = 22.


Phenology: Spores mature in summer.
Habitat: Emergent or in shallow water of lakes, ponds, streams, and ditches

Distribution

V2 513-distribution-map.gif

Ont., Ala., Ark., Conn., Del., Fla., Ga., Ill., Ind., Ky., Md., Mass., Mich., Mo., N.H., N.J., N.Y., N.C., Ohio, Pa., R.I., S.C., Tenn., Vt., Va., W.Va.

Discussion

Isoëtes engelmannii is the most widely distributed quillwort of eastern North America. Plants with larger megaspores, ranging from 480–560 μm, have been called I. engelmannii var. georgiana Engelmann. This variety may represent a tetraploid cytotype. A tetraploid population of I. engelmannii (2n = 44) from northern Florida has larger megaspores characteristic of var. georgiana.

Isoëtes engelmannii hybridizes with I. echinospora [ = I. x eatonii Dodge (later synonym = I. x gravesii A. A. Eaton); I. flaccida; I. tuckermanii [ = I. x foveolata A. A. Eaton ex Dodge]; I. lacustris; and I. riparia [ = I. x brittonii Brunton & W. C. Taylor].

Selected References

None.

Lower Taxa

None.
... more about "Isoëtes engelmannii"
W. Carl Taylor +, Neil T. Luebke +, Donald M. Britton +, R. James Hickey +  and Daniel F. Brunton +
A. Braun +
Engelmann's quillwort +
Ont. +, Ala. +, Ark. +, Conn. +, Del. +, Fla. +, Ga. +, Ill. +, Ind. +, Ky. +, Md. +, Mass. +, Mich. +, Mo. +, N.H. +, N.J. +, N.Y. +, N.C. +, Ohio +, Pa. +, R.I. +, S.C. +, Tenn. +, Vt. +, Va. +  and W.Va. +
Emergent or in shallow water of lakes, ponds, streams, and ditches +
Spores mature in summer. +
Isoëtes valida +
Isoëtes engelmannii +
Isoëtes +
species +