View source for Leucodon ← Leucodon You do not have permission to edit this page, for the following reason: The action you have requested is limited to users in the group: Users. You can view and copy the source of this page. {{Treatment/ID |accepted_name=Leucodon |accepted_authority=Schwagrichen |publications={{Treatment/Publication |title=Sp. Musc. Frond. Suppl. |place=1(2): 1. 1816 |year=1816 }} |basionyms= |synonyms= |hierarchy=Leucodontaceae;Leucodon |hierarchy_nav=<div class="higher-taxa"><div class="higher-taxon"><small>family</small>[[Leucodontaceae]]</div><div class="higher-taxon"><small>genus</small>[[Leucodon]]</div></div> |etymology=Greek leukos, white, and odon, tooth, alluding to pale peristome teeth |volume=Volume 28 |mention_page=page 590, 644, 646 |treatment_page=page 593 }}<!-- --><span class="statement" id="st-undefined" data-properties=""><b>Plants </b>medium-sized to large, in rigid tufts, green to brownish, glossy or dull. <b>Stems</b> irregularly branched, usually simple. <b>Stem</b> leaves ovate to ovate-lanceolate; base not cordate, occasionally rounded, not decurrent; margins plane to reflexed or revolute, entire; apex abruptly or gradually slender-acuminate; ecostate; alar cells quadrate, region large; laminal cells smooth or rarely slightly papillose distally over cell lumina; medial laminal cells oblong-rhomboidal to linear; apical cells smooth or papillose, or rarely so abaxially. <b>Branch</b> leaves imbricate, erect-appressed when dry, ascending to spreading when moist, ovate-lanceolate, somewhat concave, larger than stem leaves; margins plane to reflexed, entire or serrulate distally; apex acute to acuminate. <b>Specialized</b> asexual reproduction absent or by small, slender, caducous axillary branchlets. <b>Perigonia</b> axillary, gemmiform. <b>Perichaetia</b> on short, lateral branches, leaves strongly differentiated, greatly elongate, sheathing. <b>Seta</b> short to elongate. <b>Capsule</b> immersed to exserted, ovoid to pyriform; annulus cells in several rows, differentiated; operculum conic or oblique-rostrate; exostome teeth linear, papillose; endostome basal membrane low, segments imperfectly connate, papillose.</span><!-- -->{{Treatment/Body |distribution=Nearly worldwide;except Australia and Oceania;temperate and warm regions. |discussion=<p>Species ca. 30 (3 in the flora).</p><!-- --><p><i>Leucodon</i> is distinguished from the other genera in the family by its ecostate leaves and smooth calyptra. <i>Forsstroemia</i> is similar, but its plants are more glossy and the leaves are variably costate. Also, according to L. R. Stark (1985), paraphyses are present in the perichaetia of <i>Forsstroemia</i> but absent in <i>Leucodon</i>. In <i>Leucodon</i>, the axillary hairs are 3–5 per leaf axil, of two short proximal cells with brownish walls, and two or three longer distal cells. The stems are erect to spreading (or rarely pendent), straight or curved, and terete-foliate. The leaf apices are straight or falcate, sometimes filiform. The medial laminal cells are thick-walled and often porose. The calyptra is cucullate, or split on one side but gripping the seta below the capsule, and is naked. The exostome teeth are imperfect, perforate, and sometimes 2-fid.</p> |tables= |references= }}<!-- --><div class="treatment-key"> ==Key== <div class="treatment-key-group"> {| class="wikitable fna-keytable" |-id=key-0-1 |1 |Leaves not plicate, not secund; apical laminal cells papillose abaxially; stems julaceous, short or rarely elongate; fragile branchlets in distal leaf axils absent. |[[Leucodon julaceus|Leucodon julaceus]] |-id=key-0-1 |1 |Leaves ± plicate, secund or rarely so; apical laminal cells smooth or rarely papillose abaxially; stems not julaceous, elongate; fragile branchlets in distal leaf axils present or absent |[[#key-0-2| > 2]] |-id=key-0-2 |2 |Caducous branchlets absent; perichaetia, perigonia, and sporophytes common; leaves erect-appressed to secund; apical laminal cells smooth abaxially; terminal laminal cell concolorous to hyaline. |[[Leucodon brachypus|Leucodon brachypus]] |-id=key-0-2 |2 |Caducous branchlets common, sometimes scarce or apparently absent; perichaetia extremely rare, perigonia and sporophytes unknown; leaves erect-appressed, rarely secund; apical laminal cells rarely papillose abaxially; terminal laminal cell hyaline. |[[Leucodon andrewsianus|Leucodon andrewsianus]] |} </div></div><!-- -->{{#Taxon: name=Leucodon |author=William D. Reese† |authority=Schwagrichen |rank=genus |parent rank=family |synonyms= |basionyms= |family=Leucodontaceae |distribution=Nearly worldwide;except Australia and Oceania;temperate and warm regions. |reference=None |publication title=Sp. Musc. Frond. Suppl. |publication year=1816 |special status= |source xml=https://bitbucket.org/aafc-mbb/fna-data-curation/src/2e0870ddd59836b60bcf96646a41e87ea5a5943a/coarse_grained_fna_xml/V28/V28_930.xml |genus=Leucodon }}<!-- -->[[Category:Treatment]][[Category:Leucodontaceae]] Templates used on this page: Template:Leucodontaceae (view source) Template:Treatment/AuthorLink (view source) Template:Treatment/Body (view source) Template:Treatment/Body/Maps (view source) Template:Treatment/ID (view source) Template:Treatment/Publication (view source) Return to Leucodon.