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-d0_s0" data-properties="whole_organism size;whole_organism coloration;whole_organism reflectance;whole_organism reflectance;whole_organism growth form;tuft texture"><b>Plants </b>medium-sized to large, in rigid tufts, green to brownish, glossy or dull.</span> <span class="statement" id="st-d0_s1" data-properties="stem architecture;stem architecture"><b>Stems </b>irregularly branched, usually simple.</span> <span class="statement" id="st-d0_s2" data-properties="stem-leaf shape"><b>Stem-</b>leaves ovate to ovatelanceolate;</span> <span class="statement" id="st-d0_s3" data-properties="base shape;base shape;base shape">base not cordate, occasionally rounded, not decurrent;</span> <span class="statement" id="st-d0_s4" data-properties="margin shape;margin orientation;margin shape or vernation;margin architecture or shape">margins plane to reflexed or revolute, entire;</span> <span class="statement" id="st-d0_s5" data-properties="">apex abruptly or gradually slender-acuminate;</span> <span class="statement" id="st-d0_s6" data-properties="">ecostate;</span> <span class="statement" id="st-d0_s7" data-properties="apex shape;cell shape;region size">alar cells quadrate, region large;</span> <span class="statement" id="st-d0_s8" data-properties="laminal cell relief;laminal cell relief">laminal cells smooth or rarely slightly papillose distally over cell lumina;</span> <span class="statement" id="st-d0_s9" data-properties="medial laminal cell shape">medial laminal cells oblong-rhomboidal to linear;</span> <span class="statement" id="st-d0_s10" data-properties="apical cell relief;apical cell relief">apical cells smooth or papillose, or rarely so abaxially.</span> <span class="statement" id="st-d0_s11" data-properties="branch leaf arrangement;branch leaf fixation or orientation;branch leaf orientation;branch leaf shape;branch leaf shape;branch leaf size"><b>Branch </b>leaves imbricate, erect-appressed when dry, ascending to spreading when moist, ovatelanceolate, somewhat concave, larger than stem-leaves;</span> <span class="statement" id="st-d0_s12" data-properties="margin shape;margin orientation;margin architecture or shape;margin architecture or shape">margins plane to reflexed, entire or serrulate distally;</span> <span class="statement" id="st-d0_s13" data-properties="">apex acute to acuminate.</span> <span class="statement" id="st-d0_s14" data-properties="apex shape;apex development;axillary branchlet reproduction;axillary branchlet presence;axillary branchlet size;axillary branchlet size;axillary branchlet duration"><b>Specialized </b>asexual reproduction absent or by small, slender, caducous axillary branchlets.</span> <span class="statement" id="st-d0_s15" data-properties="perigonium position;perigonium shape"><b>Perigonia </b>axillary, gemmiform.</span> <span class="statement" id="st-d0_s16" data-properties="lateral branch height or length or size;leaf variability;leaf shape;leaf architecture or shape"><b>Perichaetia </b>on short, lateral branches, leaves strongly differentiated, greatly elongate, sheathing.</span> <span class="statement" id="st-d0_s17" data-properties="seta size"><b>Seta </b>short-to-elongate.</span> <span class="statement" id="st-d0_s18" data-properties="capsule prominence;capsule position;capsule shape"><b>Capsule </b>immersed to exserted, ovoid to pyriform;</span> <span class="statement" id="st-d0_s19" data-properties="annulus cell variability;row quantity">annulus cells in several rows, differentiated;</span> <span class="statement" id="st-d0_s20" data-properties="operculum shape;operculum shape">operculum conic or oblique-rostrate;</span> <span class="statement" id="st-d0_s21" data-properties="exostome tooth arrangement or course or shape;exostome tooth relief">exostome teeth linear, papillose;</span> <span class="statement" id="st-d0_s22" data-properties="basal membrane position;segment fusion;segment relief">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>Leucodon is distinguished from the other genera in the family by its ecostate leaves and smooth calyptra. Forsstroemia 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 Forsstroemia but absent in Leucodon. In Leucodon, 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://bibilujan@bitbucket.org/aafc-mbb/fna-fine-grained-xml.git/src/84153f6d59a0a91d69695978a64cee7560374f8e/V28/V28_930.xml |genus=Leucodon |annulus cell variability=differentiated |apex development=specialized |apex shape=acute;acuminate |apical cell relief=papillose;smooth |axillary branchlet duration=caducous |axillary branchlet presence=absent |axillary branchlet reproduction=asexual |axillary branchlet size=slender;small |basal membrane position=low |base shape=not decurrent;rounded;not cordate |branch leaf arrangement=imbricate |branch leaf fixation or orientation=erect-appressed |branch leaf orientation=ascending;spreading |branch leaf shape=concave;ovatelanceolate |branch leaf size=larger |capsule position=exserted |capsule prominence=immersed |capsule shape=ovoid;pyriform |cell shape=quadrate |exostome tooth arrangement or course or shape=linear |exostome tooth relief=papillose |laminal cell relief=papillose;smooth |lateral branch height or length or size=short |leaf architecture or shape=sheathing |leaf shape=elongate |leaf variability=differentiated |margin architecture or shape=serrulate;entire;entire |margin orientation=reflexed;reflexed |margin shape=plane;plane |margin shape or vernation=revolute |medial laminal cell shape=oblong-rhomboidal;linear |operculum shape=oblique-rostrate;conic |perigonium position=axillary |perigonium shape=gemmiform |region size=large |row quantity=several |segment fusion=connate |segment relief=papillose |seta size=short;elongate |stem architecture=simple;branched |stem-leaf shape=ovate;ovatelanceolate |tuft texture=rigid |whole_organism coloration=green;brownish |whole_organism growth form=plant |whole_organism reflectance=dull;glossy |whole_organism size=medium-sized;large }}<!-- -->[[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.