View source for Isopterygium

{{Treatment/ID
|accepted_name=Isopterygium
|accepted_authority=Mitten
|publications={{Treatment/Publication
|title=J. Linn. Soc., Bot.
|place=12: 21, 497. 1869
|year=1869
}}
|basionyms=
|synonyms=
|hierarchy=Hypnaceae;Isopterygium
|hierarchy_nav=<div class="higher-taxa"><div class="higher-taxon"><small>family</small>[[Hypnaceae]]</div><div class="higher-taxon"><small>genus</small>[[Isopterygium]]</div></div>
|etymology=Greek isos, equal, and pteron, wing, alluding to complanate leaves
|volume=Volume 28
|mention_page=page 516, 553, 646, 647
|treatment_page=page 552
}}<!--

--><span class="statement" id="st-undefined" data-properties=""><b>Plants </b>small to medium-sized, in thin to dense mats, whitish, yellowish, or green, glossy. <b>Stems</b> creeping, simple or sparingly and irregularly branched; hyalodermis absent, central strand usually absent; pseudoparaphyllia filamentous, 1 (or 2)-seriate at base. <b>Stem</b> and branch leaves similar, erect-spreading to squarrose, ovate or lanceolate, not plicate; base not decurrent or rarely 1 or 2 cells decurrent; margins plane to erect, serrulate to entire proximally, serrate to serrulate distally, or rarely entire throughout; apex acuminate; costa double and short or sometimes ecostate; alar cells usually clearly differentiated, quadrate to rectangular, rarely transversely elongate; laminal cells smooth. <b>Specialized</b> asexual reproduction sometimes present as filamentous, multicellular, branched brood bodies on stems and branches, cells papillose. <b>Sexual</b> condition autoicous [rarely dioicous]; perichaetia at base of stems, leaves oblong-lanceolate, apex gradually acuminate. <b>Seta</b> yellow, brown, or reddish brown. <b>Capsule</b> inclined to cernuous, sometimes erect, ovoid to ellipsoid, straight or arcuate when mature, usually contracted below mouth and sometimes wrinkled at neck when dry; annulus absent; operculum conic to short-rostrate; peristome double; exostome teeth with external surface cross striolate proximally, papillose distally; endostome basal membrane high to low, segments keeled, cilia shorter than segments, in groups of 1–3, sometimes absent. <b>Calyptra</b> naked. <b>Spores</b> spheric to ovoid, smooth or minutely papillose.</span><!--

-->{{Treatment/Body
|distribution=North America;Mexico;West Indies;Central America;South America;s Europe (Italy);Asia;Africa;Pacific Islands;Australia.
|discussion=<p>Species 120–140 (2 in the flora).</p><!--
--><p><i>Isopterygium</i> occurs predominately in terrestrial habitats at low elevations in the subtropics and tropics. Many of the names in this genus will undoubtedly prove synonymous with those of other taxa after revision. Plants of this genus have complanate-foliate stems with small, thick-walled cortical cells and larger, thinner walled inner cells; the smooth rhizoids arise on the ventral surfaces of stems and branches just below the junctures of leaves; and the axillary hairs have one short-rectangular basal cell and one elongate apical cell. The leaves are crowded, imbricate, often asymmetric, and flat or somewhat concave, sometimes with pitted basal laminal cells. The perigonia are scattered along the stems; the setae are usually twisted; the capsules are smooth; and the exostome teeth are bordered and internally trabeculate.</p>
|tables=
|references={{Treatment/Reference
|id=iwatsuki1987a
|text=Iwatsuki, Z. 1987. Notes on Isopterygium Mitt. (Plagiotheciaceae). J. Hattori Bot. Lab. 63: 445–451.
}}
}}<!--

--><div class="treatment-key">
==Key==
<div class="treatment-key-group">
  
{| class="wikitable fna-keytable"
|-id=key-0-1
|1
|Plants small; stems seldom larger than 2 cm; leaves 0.7-1.8 × 0.2-0.6 mm, not or slightly wrinkled when dry; setae 0.5-1.5 cm.
|[[Isopterygium tenerum|Isopterygium tenerum]]
|-id=key-0-1
|1
|Plants medium-sized; stems 2-4 cm; leaves 1-1.5 × 0.4-0.7 mm, usually wrinkled and contorted when dry; setae 2-3 cm.
|[[Isopterygium tenerifolium|Isopterygium tenerifolium]]
|}
</div></div><!--

-->{{#Taxon:
name=Isopterygium
|author=Robert R. Ireland Jr.
|authority=Mitten
|rank=genus
|parent rank=family
|synonyms=
|basionyms=
|family=Hypnaceae
|distribution=North America;Mexico;West Indies;Central America;South America;s Europe (Italy);Asia;Africa;Pacific Islands;Australia.
|reference=iwatsuki1987a
|publication title=J. Linn. Soc., Bot.
|publication year=1869
|special status=
|source xml=https://jpend@bitbucket.org/aafc-mbb/fna-data-curation.git/src/f50eec43f223ca0e34566be0b046453a0960e173/coarse_grained_fna_xml/V28/V28_859.xml
|genus=Isopterygium
}}<!--

-->[[Category:Treatment]][[Category:Hypnaceae]]