View source for Elodium

{{Treatment/ID
|accepted_name=Elodium
|accepted_authority=(Sullivant) Austin
|publications={{Treatment/Publication
|title=Musci Appalach.,
|place=52. 1870
|year=1870
}}
|basionyms={{Treatment/ID/Basionym
|name=Hypnum sect. Elodium
|authority=Sullivant
|rank=section
|publication_title=in A. Gray, Manual ed.
|publication_place=2, 668. 1856
}} {{Treatment/ID/Basionym
|name=Helodium
|authority=
|rank=genus
|publication_title=name conserved
|publication_place=
}}
|synonyms=
|hierarchy=Helodiaceae;Elodium
|hierarchy_nav=<div class="higher-taxa"><div class="higher-taxon"><small>family</small>[[Helodiaceae]]</div><div class="higher-taxon"><small>genus</small>[[Elodium]]</div></div>
|etymology=Greek helos, marsh or marsh-meadow, and Latin -ium, diminutive, alluding to habitat
|volume=Volume 28
|mention_page=page 323, 648
|treatment_page=page 321
}}<!--

--><span class="statement" id="st-d0_s0" data-properties="whole_organism size;whole_organism coloration;whole_organism growth form"><b>Plants </b>medium-sized to large, green to yellowbrown.</span> <span class="statement" id="st-d0_s1" data-properties="stem orientation;stem orientation;stem architecture or shape"><b>Stems </b>erect or spreading, regularly ± 1-pinnate;</span> <span class="statement" id="st-d0_s2" data-properties="paraphyllium shape;paraphyllium architecture;paraphyllium architecture;paraphyllium architecture;cell shape;cell quantity;cell quantity;cell architecture or pubescence or relief;apical cell-wall width;apical cell-wall width">paraphyllia filiform and narrowly lanceolate-foliose, branched or sometimes simple, cells long-rectangular, to 20: 1, smooth, apical cell-walls thin or somewhat thicker at tip;</span> <span class="statement" id="st-d0_s3" data-properties="paraphyllium shape;paraphyllium architecture;paraphyllium architecture;paraphyllium architecture;cell shape;cell quantity;pseudoparaphyllium architecture;margin architecture or shape;proximal cell shape;proximal cell height or length or size;proximal cell shape;proximal cell architecture or pubescence or relief">pseudoparaphyllia lanceolate-foliose, margins serrulate, proximal cells subquadrate, short to long-rectangular, smooth.</span> <span class="statement" id="st-d0_s4" data-properties="stem-leaf orientation;stem-leaf orientation;stem-leaf shape"><b>Stem-</b>leaves erect or erect-spreading, ovatelanceolate to rounded-cordate;</span> <span class="statement" id="st-d0_s5" data-properties="margin shape or vernation;margin shape or vernation;margin architecture or shape;margin shape;margin shape">margins irregularly revolute proximally or strongly, broadly or narrowly revolute to apex, entire and minutely toothed near apex, or denticulate throughout;</span> <span class="statement" id="st-d0_s6" data-properties="apex shape;acumen width;acumen size">apex abruptly to gradually narrowed, acumen broad or slender;</span> <span class="statement" id="st-d0_s7" data-properties="costa surface insertion;costa surface architecture or pubescence or relief">costa surface smooth or with 1 or 2 teeth near insertion;</span> <span class="statement" id="st-d0_s8" data-properties="laminal cell relief;abaxial surface relief or texture;papilla size;papilla fragility">laminal cells with abaxial surface roughened, 1-papillose centrally over lumen or more often near distal ends, papillae small, delicate;</span> <span class="statement" id="st-d0_s9" data-properties="medial cell shape">medial cells elongate;</span> <span class="statement" id="st-d0_s10" data-properties="apical cell quantity;apical cell quantity;apical cell size or width;papilla position">apical cell 6–7: 1, variously somewhat thickened distally, sometimes with one low papilla.</span> <span class="statement" id="st-d0_s11" data-properties=""><b>Branch </b>leaves similar.</span> <span class="statement" id="st-d0_s12" data-properties="branch leaf reproduction;branch leaf reproduction"><b>Sexual </b>condition autoicous;</span> <span class="statement" id="st-d0_s13" data-properties="leaves cilium presence">perichaetia inner leaves cilia absent.</span> <span class="statement" id="st-d0_s14" data-properties="seta some measurement"><b>Seta </b>2–6 cm.</span> <span class="statement" id="st-d0_s15" data-properties=""><b>Capsule </b>with stomata present in neck.</span> <span class="statement" id="st-d0_s16" data-properties="spore atypical some measurement;spore atypical some measurement;spore some measurement"><b>Spores </b>(10–) 11–15 (–16) µm.</span><!--

-->{{Treatment/Body
|distribution=North America;Eurasia
|discussion=<p>Species 3 (3 in the flora).</p><!--
--><p>Elodium is distinguished from species of Thuidiaceae by its 1-pinnate branches with narrowly tapering branch ends. The marginal laminal cells in the often twisted acumen of species of Elodium are shorter than the cells mid acumen and produce a smooth, short apical cell. The basal laminal cells are larger, laxer, and paler than the more distal cells; in Echinophyllum they are thick-walled and short-rectangular to (sub)quadrate and concolorous. The perichaetial leaves of Elodium are nearly smooth throughout and bordered by minute, uniform denticulations, or sharply, distantly and irregularly toothed from distal cell ends. In Echinophyllum, the margins are sparsely short-ciliate with hyaline, long-celled, narrow teeth composed of (1 or) 2 elongate cells, free but parallel to the edge of the lamina. Both Elodium elodioides and E. paludosum seem intermediate in habitat preferences and able to tolerate seasonal desiccation.</p>
|tables=
|references=
}}<!--

--><div class="treatment-key">
==Key==
<div class="treatment-key-group">
  
{| class="wikitable fna-keytable"
|-id=key-0-1
|1
|Stems with central strand absent; stems closely, evenly pinnate, branches nearly equal; leaf apices short-acuminate; setae 4-6 cm; capsules 3-4 mm; paraphyllia to 27 cells in length.
|[[Elodium blandowii|Elodium blandowii]]
|-id=key-0-1
|1
|Stems with central strand present; stems loosely subpinnate, branches unequal; leaf apices long-acuminate; setae 2-2.8 cm; capsules 2-2.5 mm; paraphyllia 7-11 cells in length
|[[#key-0-2| > 2]]
|-id=key-0-2
|2
|Leaves broadly cordate-ovate; apices abruptly acuminate; laminal cell walls thick, especially in margins, abaxial surface strongly 1-papillose centrally or nearer distal ends of lumen; leaf costa proximal abaxial surfaces with 1 or 2 scattered teeth.
|[[Elodium elodioides|Elodium elodioides]]
|-id=key-0-2
|2
|Leaves ovate-lanceolate; apices gradually acuminate; laminal cell walls thin, especially in margins, abaxial surface smooth or weakly papillose-prorulose; leaf costa proximal abaxial surfaces smooth.
|[[Elodium paludosum|Elodium paludosum]]
|}
</div></div><!--

-->{{#Taxon:
name=Elodium
|author=Patricia M. Eckel
|authority=(Sullivant) Austin
|rank=genus
|parent rank=family
|synonyms=
|basionyms=Hypnum sect. Elodium;Helodium
|family=Helodiaceae
|distribution=North America;Eurasia
|reference=None
|publication title=Musci Appalach.,
|publication year=1870
|special status=
|source xml=https://bibilujan@bitbucket.org/aafc-mbb/fna-fine-grained-xml.git/src/84153f6d59a0a91d69695978a64cee7560374f8e/V28/V28_500.xml
|genus=Elodium
|abaxial surface relief or texture=roughened
|acumen size=slender
|acumen width=broad
|apex shape=narrowed
|apical cell quantity=1;6;7
|apical cell size or width=thickened
|apical cell-wall width=thicker;thin
|branch leaf reproduction=autoicous;sexual
|cell architecture or pubescence or relief=smooth
|cell quantity=0;20
|cell shape=long-rectangular;long-rectangular
|costa surface architecture or pubescence or relief=near with 1 or 2teeth insertion
|costa surface insertion=smooth
|laminal cell relief=1-papillose
|leaves cilium presence=absent
|margin architecture or shape=entire;serrulate
|margin shape=denticulate;toothed
|margin shape or vernation=revolute;revolute
|medial cell shape=elongate
|papilla fragility=delicate
|papilla position=low
|papilla size=small
|paraphyllium architecture=simple;branched;lanceolate-foliose;simple;branched;lanceolate-foliose
|paraphyllium shape=filiform;filiform
|proximal cell architecture or pubescence or relief=smooth
|proximal cell height or length or size=short
|proximal cell shape=long-rectangular;subquadrate
|pseudoparaphyllium architecture=lanceolate-foliose
|seta some measurement=2cm;6cm
|spore atypical some measurement=15um;16um
|spore some measurement=11um;15um
|stem architecture or shape=1-pinnate
|stem orientation=spreading;erect
|stem-leaf orientation=erect-spreading;erect
|stem-leaf shape=ovatelanceolate;rounded-cordate
|whole_organism coloration=green;yellowbrown
|whole_organism growth form=plant
|whole_organism size=medium-sized;large
}}<!--

-->[[Category:Treatment]][[Category:Helodiaceae]]