View source for Pseudocalliergon

{{Treatment/ID
|accepted_name=Pseudocalliergon
|accepted_authority=(Limpricht) Loeske
|publications={{Treatment/Publication
|title=Hedwigia
|place=46: 311. 1907
|year=1907
}}
|basionyms={{Treatment/ID/Basionym
|name=Hypnum sect. Pseudocalliergon
|authority=Limpricht
|publication_title=Laubm. Deutschl.
|publication_place=3: 547. 1899 (as Pseudo-calliergon)
}}
|synonyms=
|hierarchy=Amblystegiaceae;Pseudocalliergon
|hierarchy_nav=<div class="higher-taxa"><div class="higher-taxon"><small>family</small>[[Amblystegiaceae]]</div><div class="higher-taxon"><small>genus</small>[[Pseudocalliergon]]</div></div>
|etymology=Greek pseudes, false, and genus Calliergon
|volume=Volume 28
|mention_page=page 266, 298, 306, 647, 655, 656
|treatment_page=page 297
}}<!--

--><span class="statement" id="st-undefined" data-properties=""><b>Plants </b>medium-sized to large, green, brown-green, yellowish, or yellow-brown. <b>Stems</b> unbranched to irregularly pinnate, ± in one plane; hyalodermis absent, central strand present; paraphyllia absent; rhizoids or rhizoid initials on stem or abaxial costa insertion, rarely forming tomentum, slightly branched, smooth; axillary hairs well developed, many, distal cells 1–2(–3), yellow or brownish when young. <b>Stem</b> leaves imbricate, erectopatent, patent, or sometimes spreading, straight or falcate, ovate-lanceolate to very broadly ovate, not plicate, longer than 1 mm; base not decurrent (decurrent in <i>P. trifarium</i>); margins plane, entire, very finely or distinctly denticulate, limbidia absent; apex broadly rounded, apiculate, or acuminate, acumen plane or furrowed; costa single to mid leaf or beyond, or double and short; alar cells ± differentiated, quadrate to long-rectangular, inflated or not, yellow when mature, walls thin to strongly incrassate, region indistinctly delimited, transversely triangular or sometimes in one transverse basal row, large; medial laminal cells linear; marginal cells 1-stratose. <b>Sexual</b> condition dioicous. <b>Capsule</b> horizontal to inclined, cylindric, curved; peristome perfect or nearly so; exostome margins weakly dentate distally; endostome cilia 1–4, well developed, nodose. <b>Spores</b> 10–18 µm.</span><!--

-->{{Treatment/Body
|distribution=North America;West Indies;South America;Eurasia;Africa;Atlantic Islands.
|discussion=<p>Species 5 (4 in the flora).</p><!--
--><p><i>Pseudocalliergon</i> is typically found in mineral-rich to strongly calcareous habitats. Excepting <i>P. angustifolium</i>, the shoots are generally turgid, with markedly broad leaves. All species become yellow-brown when old; when dry they frequently have a golden metallic gloss in spots, that is rare only in <i>P. trifarium</i> (readily visible in the dissecting microscope). The alar regions consist of few or often many quadrate to long-rectangular cells, often with yellow walls, thin-walled to often strongly incrassate, and form indistinctly delimited transversely triangular groups or sometimes single transverse basal rows. Species of <i>Pseudocalliergon</i> are somewhat similar to those of <i>Drepanocladus</i>, but dry plants of <i>Pseudocalliergon</i> usually have a golden metallic gloss that is absent in <i>Drepanocladus</i>, alar regions are more diffusely delimited and consist of less strongly inflated cells than in the latter, axillary hairs are usually yellowish when young only in <i>Pseudocalliergon</i>, and habitats of the <i>Pseudocalliergon</i> species are usually nutrient-poor, whereas those of <i>Drepanocladus</i> species are more or less nutrient-rich. Despite morphological distinctness, molecular data suggest that the <i>Pseudocalliergon</i> species are nested within <i>Drepanocladus</i> (L. Hedenäs and C. Rosborg 2008). Characters differentiating <i>Pseudocalliergon</i> from 14. <i>Sanionia</i> are mentioned under the latter genus.</p>
|tables=
|references=
}}<!--

--><div class="treatment-key">
==Key==
<div class="treatment-key-group">
  
{| class="wikitable fna-keytable"
|-id=key-0-1
|1
|Stem leaves falcate, gradually or somewhat suddenly narrowed to apex; apices acuminate
|[[#key-0-2| > 2]]
|-id=key-0-1
|1
|Stem leaves straight, suddenly narrowed to apex; apices rounded or apiculate
|[[#key-0-3| > 3]]
|-id=key-0-2
|2
|Stem leaves ovate-lanceolate to broadly ovate; apices long-acuminate; costae single, 3-5-stratose, (31-)38-70(-74) µm wide at base; distal laminal cells often prorate abaxially; boreal or mountainous areas.
|[[Pseudocalliergon angustifolium|Pseudocalliergon angustifolium]]
|-id=key-0-2
|2
|Stem leaves ovate to very broadly ovate; apices short- to long-acuminate; costae single, 2- or 3-stratose, 21-53 µm wide at base, or sometimes double; distal laminal cells smooth; Arctic areas.
|[[Pseudocalliergon brevifolium|Pseudocalliergon brevifolium]]
|-id=key-0-3
|3
|Stem leaf apices broadly obtuse or rounded, short-apiculate.
|[[Pseudocalliergon turgescens|Pseudocalliergon turgescens]]
|-id=key-0-3
|3
|Stem leaf apices broadly rounded.
|[[Pseudocalliergon trifarium|Pseudocalliergon trifarium]]
|}
</div></div><!--

-->{{#Taxon:
name=Pseudocalliergon
|author=Lars Hedenäs;Norton G. Miller†
|authority=(Limpricht) Loeske
|rank=genus
|parent rank=family
|synonyms=
|basionyms=Hypnum sect. Pseudocalliergon
|family=Amblystegiaceae
|distribution=North America;West Indies;South America;Eurasia;Africa;Atlantic Islands.
|reference=None
|publication title=Hedwigia
|publication year=1907
|special status=
|source xml=https://jpend@bitbucket.org/aafc-mbb/fna-data-curation.git/src/f6b125a955440c0872999024f038d74684f65921/coarse_grained_fna_xml/V28/V28_464.xml
|genus=Pseudocalliergon
}}<!--

-->[[Category:Treatment]][[Category:Amblystegiaceae]]