View source for Pleuridium acuminatum

{{Treatment/ID
|accepted_name=Pleuridium acuminatum
|accepted_authority=Lindberg
|publications={{Treatment/Publication
|title=Öfvers. Kongl. Vetensk.-Akad. Förh.
|place=20: 406. 1863,
}}
|basionyms=
|synonyms={{Treatment/ID/Synonym
|name=Pleuridium bakeri
|authority=Cardot & Thériot
|rank=species
}} {{Treatment/ID/Synonym
|name=Pleuridium bakeri var. elongatum
|authority=Cardot & Thériot
|rank=variety
}} {{Treatment/ID/Synonym
|name=Pleuridium bolanderi
|authority=Grout
|rank=species
}} {{Treatment/ID/Synonym
|name=Pleuridium californicum
|authority=Austin
|rank=species
}} {{Treatment/ID/Synonym
|name=Pleuridium stramineum
|authority=
|rank=species
}}
|hierarchy=Ditrichaceae;Pleuridium;Pleuridium acuminatum
|hierarchy_nav=<div class="higher-taxa"><div class="higher-taxon"><small>family</small>[[Ditrichaceae]]</div><div class="higher-taxon"><small>genus</small>[[Pleuridium]]</div><div class="higher-taxon"><small>species</small>[[Pleuridium acuminatum]]</div></div>
|volume=Volume 27
|mention_page=page 465
|treatment_page=page 464
}}<!--

--><span class="statement" id="st-undefined" data-properties=""><b>Stem </b>leaves patent-erect, spreading, concave, occasionally plicate, lamina 2-stratose distally (appearing multistratose in extreme forms), 1-stratose at base; proximal leaves ovate to deltoid, long-acuminate, 0.18–1.1 × 0.1–0.28 mm, entire proximally, serrulate distally; distal stem leaves deltoid to ovate, long-acuminate, 0.58–1.88 × 0.15–0.35 mm, entire proximally, serrulate distally along the margin of the acumen to serrate with anteriorly projecting cell ends on the abaxial surface of costa; costa broad, percurrent. <b>Sexual</b> condition paroicous, 1–2(–3) antheridia naked or subtended by 1(–2) bracts in the distal leaf axils proximal to the perichaetium, generally in 1–2 leaf axils per stem. <b>Perichaetial</b> leaves with oblong-ovate to lanceolate base, gradually to abruptly narrowed to a subulate to acuminate tip, 1.25–4.3 × 0.25–0.5 mm, margins entire proximally, plane to incurved, entire to irregularly serrulate distally especially along margin of acumen, marginal cells short-rectangular to quadrate; basal cells loosely rectangular to quadrate; median cells subquadrate to rectangular to trapezoidal; distal cells in acumen linear; costa percurrent, indistinctly defined, filling the cucullate acumen; transverse section of costa at mid leaf showing a row of central guide cells confluent with the adaxial laminal cells, a widespread abaxial band of stereids, a restricted adaxial group of stereids, and a few thin-walled accessory cells in the center; innermost perichaetial leaves long-lanceolate with an acuminate tip, percurrent, 1.13–2.6 × 0.11–0.25 mm. <b>Seta</b> 0.075–0.5 mm. <b>Spores</b> 20–30(–35) µm, densely papillose, light orange-brown in mass.</span><!--

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|habitat=Tufts on open disturbed soil, old fields, along railways and roads on sandy banks
|elevation=low to moderate elevations
|distribution=B.C.;Ala.;Ark.;Calif.;Ga.;Kans.;La.;Mass.;Md.;Mo.;N.C.;Ohio;Okla.;Oreg.;Pa.;Md.;N.Y.;Va.;Wash.;W.Va.;Europe;Asia (China);s Africa;Atlantic Islands;Pacific Islands (New Zealand).
|discussion=<p>The chromosome number of <i>Pleuridium acuminatum</i> is n = 26 (V. S. Bryan 1956; H. A. Crum and L. E. Anderson 1981). The species is characterized by (1) the paroicous sexual condition and (2) the 2-stratose leaf lamina at shoulder. The bolanderi and the stramineum expressions represent intermediate variations between the common variant of <i>P. acuminatum</i> (with a sporadically 2-stratose lamina) and the californicum expression (almost completely 2-stratose). W. C. Steere et al. (1954) and Bryan have pointed out that the n = 26 chromosome count in the bolanderi expression provides evidence for its conspecificity with <i>P. acuminatum</i>. The stramineum, bakeri, and elongatum expressions have long been treated as taxonomic synonyms of the bolanderi expression (Anderson et al. 1990; E. G. Britton 1913b; Crum et al. 1973; A. J. Grout 1928–1940, vol. 1; E. Lawton 1971). Specialized asexual reproduction by rhizoidal tubers has been reported.</p>
|tables=
|references=
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-->{{#Taxon:
name=Pleuridium acuminatum
|authority=Lindberg
|rank=species
|parent rank=genus
|synonyms=Pleuridium bakeri;Pleuridium bakeri var. elongatum;Pleuridium bolanderi;Pleuridium californicum;Pleuridium stramineum
|basionyms=
|family=Ditrichaceae
|habitat=Tufts on open disturbed soil, old fields, along railways and roads on sandy banks
|elevation=low to moderate elevations
|distribution=B.C.;Ala.;Ark.;Calif.;Ga.;Kans.;La.;Mass.;Md.;Mo.;N.C.;Ohio;Okla.;Oreg.;Pa.;Md.;N.Y.;Va.;Wash.;W.Va.;Europe;Asia (China);s Africa;Atlantic Islands;Pacific Islands (New Zealand).
|reference=None
|publication title=Öfvers. Kongl. Vetensk.-Akad. Förh.
|publication year=
|special status=
|source xml=https://jpend@bitbucket.org/aafc-mbb/fna-data-curation.git/src/f50eec43f223ca0e34566be0b046453a0960e173/coarse_grained_fna_xml/V27/V27_674.xml
|genus=Pleuridium
|species=Pleuridium acuminatum
}}<!--

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