View source for Triquetrella

{{Treatment/ID
|accepted_name=Triquetrella
|accepted_authority=Müller Hal.
|publications={{Treatment/Publication
|title=Oesterr. Bot. Z.
|place=47: 421. 1897 ,
}}
|basionyms=
|synonyms=
|hierarchy=Pottiaceae;Pottiaceae subfam. Barbuloideae;Triquetrella
|hierarchy_nav=<div class="higher-taxa"><div class="higher-taxon"><small>family</small>[[Pottiaceae]]</div><div class="higher-taxon"><small>subfamily</small>[[Pottiaceae subfam. Barbuloideae]]</div><div class="higher-taxon"><small>genus</small>[[Triquetrella]]</div></div>
|etymology=Latin triquetrus, three edged, and -ella, diminutive, alluding to leaves commonly arranged in three rows
|volume=Volume 27
|mention_page=page 479, 581
|treatment_page=page 580
}}<!--

--><span class="statement" id="st-undefined" data-properties=""><b>Plants </b>forming mats, yellowish or blackish green distally, brown or blackish proximally. <b>Stems</b> to 7 cm; hyalodermis absent, sclerodermis present, of 1–3 layers of stereid cells, central strand present [absent]; axillary hairs to 9 cells in length, the proximal 1–2 cells thick-walled. <b>Leaves</b> appressed- to spreading-incurved when dry, widely spreading to squarrose, strongly reflexed when moist; triangular to ovate-triangular, adaxial surface keeled, narrowly channeled along costa, ca. 2 mm; base ovate, proximal margins long- and broadly decurrent; distal margins recurved in middle 3/4–4/5 of leaf, entire to weakly serrulate near apex; apex narrowly acute to shortly acuminate; costa percurrent, adaxial outgrowths absent, adaxial cells elongate, in 2(–4) rows; transverse section ovate to semicircular, adaxial epidermis absent, adaxial stereid band present or absent, guide cells 2–4 in 1 layer, hydroid strand absent, abaxial stereid band present, crescentic to circular in sectional shape, abaxial epidermis weakly differentiated; proximal cells weakly differentiated in a very small group medially, occasionally across insertion, rectangular, little wider than distal cells, 2–4:1, proximal cells thick-walled, somewhat porose; distal medial cells rounded rhombic to quadrate, ca. 9–11 µm wide, 1:1, 1-stratose; papillae spiculose, mostly simple to 2-fid, 1 per lumen, cell walls thickened, weakly trigonous, weakly convex to distinctly bulging on both sides. <b>Specialized</b> asexual reproduction not seen. [Sexual condition dioicous. <b>Perichaetia</b> terminal and lateral, interior leaves strongly sheathing, ovate, rounded or shortly acuminate to apiculate. <b>Seta</b> elongate. <b>Capsule</b> stegocarpous, theca elliptic, annulus of ca. 3 rows of smaller, vesiculose cells; operculum conic; peristome teeth 16, variously cleft (usually to base) or perforate, subulate, transparent, straight. <b>Calyptra</b> cucullate. <b>Spores</b> ca. 10–13 µm.] KOH laminal color reaction orange to yellowish orange.</span><!--

-->{{Treatment/Body
|distribution=w North America;s South America;s Africa;Pacific Islands (New Zealand);Australia.
|discussion=<p>Species 9 (1 in the flora).</p><!--
--><p><i>Triquetrella</i> is distinctive in the stems rounded-triangular in section though this character is varies to rounded-pentagonal in the one species in the flora area. Although not fruiting in that area(and rarely so elsewhere in the world), the genus is unique in having both acrocarpous and pleurocarpous perichaetia on the same plant (R. H. Zander 1993). Unlike the similar <i>Leptodontium</i>, <i>Triquetrella</i> may occasionally show a small central strand (except, again, in the flora area).</p>
|tables=
|references={{Treatment/Reference
|id=stark1980a
|text=Stark, L. R. 1980. Triquetrella in North America. Bryologist 83: 363–364.
}}{{Treatment/Reference
|id=zander1980a
|text=Zander, R. H. 1980. Acid-base color reactions: The status of Triquetrella ferruginea, Barbula inaequalifolia and B. calcarea. Bryologist 83: 228–233.
}}
}}<!--

--><!--

-->{{#Taxon:
name=Triquetrella
|author=Richard H. Zander
|authority=Müller Hal.
|rank=genus
|parent rank=subfamily
|synonyms=
|basionyms=
|family=Pottiaceae
|distribution=w North America;s South America;s Africa;Pacific Islands (New Zealand);Australia.
|reference=stark1980a;zander1980a
|publication title=Oesterr. Bot. Z.
|publication year=
|special status=
|source xml=https://jpend@bitbucket.org/aafc-mbb/fna-data-curation.git/src/f6b125a955440c0872999024f038d74684f65921/coarse_grained_fna_xml/V27/V27_832.xml
|subfamily=Pottiaceae subfam. Barbuloideae
|genus=Triquetrella
}}<!--

-->[[Category:Treatment]][[Category:Pottiaceae subfam. Barbuloideae]]