View source for Dichelyma ← Dichelyma 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=Dichelyma |accepted_authority=Myrin |publications={{Treatment/Publication |title=Kongl. Vetensk. Acad. Handl. |place=1832: 273, plates 6, 7. 1833 |year=1833 }} |basionyms= |synonyms= |hierarchy=Fontinalaceae;Dichelyma |hierarchy_nav=<div class="higher-taxa"><div class="higher-taxon"><small>family</small>[[Fontinalaceae]]</div><div class="higher-taxon"><small>genus</small>[[Dichelyma]]</div></div> |etymology=Greek dicha, in two, and elyma, veil, alluding to large dimidate or cucullate calyptra |volume=Volume 28 |mention_page=page 13, 490, 492, 655 |treatment_page=page 491 }}<!-- --><span class="statement" id="st-d0_s0" data-properties="whole_organism size;whole_organism reflectance;whole_organism growth form"><b>Plants </b>small to large, glossy.</span> <span class="statement" id="st-d0_s1" data-properties="stem orientation;stem orientation"><b>Stems </b>prostrate or pendent;</span> <span class="statement" id="st-d0_s2" data-properties="rhizoid architecture;initial position">rhizoids from initials abaxial to leaf insertions, not or irregularly branched;</span> <span class="statement" id="st-d0_s3" data-properties="axillary hair some measurement;leaf arrangement;leaf arrangement;leaf shape;leaf shape;leaf arrangement or vernation">axillary hairs 100–300 µm. <b>Leaves</b> distant or crowded, lanceolate to linear-lanceolate, keeled, conduplicate;</span> <span class="statement" id="st-d0_s4" data-properties="margin shape;margin orientation;margin architecture or shape;margin architecture or shape;margin architecture or shape">margins plane or very narrowly recurved, entire or obscurely serrulate proximally, serrulate distally;</span> <span class="statement" id="st-d0_s5" data-properties="apex shape;apex shape;apex shape;apex shape;apex shape">apex obtuse, acute, or filiform-acuminate;</span> <span class="statement" id="st-d0_s6" data-properties="">costa subpercurrent to long-excurrent;</span> <span class="statement" id="st-d0_s7" data-properties="costa position;costa architecture;cell shape;cell shape;cell size;wall texture">alar cells quadrate or rectangular, not or slightly enlarged, walls firm;</span> <span class="statement" id="st-d0_s8" data-properties="medial laminal cell shape">medial laminal cells linear to linear-rhomboidal.</span> <span class="statement" id="st-d0_s9" data-properties="perigonium position"><b>Perigonia </b>lateral in leaf-axils.</span> <span class="statement" id="st-d0_s10" data-properties="leaf shape;seta architecture or shape"><b>Perichaetia </b>with leaves elongate, sheathing setae.</span> <span class="statement" id="st-d0_s11" data-properties="seta atypical some measurement;seta some measurement"><b>Seta </b>3–15 (–20) mm.</span> <span class="statement" id="st-d0_s12" data-properties="capsule prominence;capsule location;capsule location;capsule position;capsule shape;capsule shape;capsule shape;capsule shape;capsule shape;capsule shape"><b>Capsule </b>immersed, laterally emergent, emergent, or exserted, oval, oval-oblong, subcylindric, or cylindric;</span> <span class="statement" id="st-d0_s13" data-properties="annulus prominence">annulus rudimentary;</span> <span class="statement" id="st-d0_s14" data-properties="operculum shape;operculum shape">operculum conic or obliquely long-rostrate;</span> <span class="statement" id="st-d0_s15" data-properties="endostome architecture;endostome architecture">endostome trellis imperfect or perfect.</span> <span class="statement" id="st-d0_s16" data-properties="calyptra shape;base architecture or fixation"><b>Calyptra </b>long-cucullate, covering capsule and often clasping base of seta when young.</span> <span class="statement" id="st-d0_s17" data-properties="spore some measurement"><b>Spores </b>10–17 µm.</span><!-- -->{{Treatment/Body |distribution=North America;Europe;Asia |discussion=<p>Species 5 (4 in the flora).</p><!-- --><p>Dichelyma is often considered an aquatic moss, but is semi-aquatic. Distinctive gametophytic features include long, narrow, keeled-conduplicate leaves with strong, single costae and weakly developed, not or scarcely bulging alar cells. The keeled-conduplicate leaves lie flat on one side when placed on a microscope slide and so when measuring leaf width it is necessary to double the measurement. Dichelyma has long setae and long (to 7 mm), sheathing perichaetial leaves. The stems lack paraphyllia and pseudoparaphyllia, and the axillary hairs have brownish basal cells and hyaline distal cells. The endostome segments are longer than the exostome teeth. Dichelyma is often confused with species of Drepanocladus (in the broad sense). However, many species of Drepanocladus have inflated alar cells, and these all differ from Dichelyma in having plane to concave leaves that are often spirally twisted when dry and not three-ranked. Blindia (Seligeriaceae) has also been confused with Dichelyma; Blindia is acrocarpous, much smaller, and has well-developed, inflated alar cells, concave leaves, elongated setae, and a single, haplolepidous peristome. The fifth species in the genus, Dichelyma japonicum Cardot, is endemic to Japan.</p> |tables= |references= }}<!-- --><div class="treatment-key"> ==Key== <div class="treatment-key-group"> {| class="wikitable fna-keytable" |-id=key-0-1 |1 |Leaves strongly falcate to circinate at stem and branch apices. |[[Dichelyma uncinatum|Dichelyma uncinatum]] |-id=key-0-1 |1 |Leaves erect-ascending to weakly falcate at stem and branch apices |[[#key-0-2| > 2]] |-id=key-0-2 |2 |Medial stem leaves 0.7-1.4 mm wide; capsules exserted; endostome trellis perfect. |[[Dichelyma falcatum|Dichelyma falcatum]] |-id=key-0-2 |2 |Medial stem leaves 0.4-0.8 mm wide; capsules immersed or laterally emergent; endostome trellis imperfect |[[#key-0-3| > 3]] |-id=key-0-3 |3 |Leaves linear-lanceolate; apices filiform-acuminate; costae long-excurrent. |[[Dichelyma capillaceum|Dichelyma capillaceum]] |-id=key-0-3 |3 |Leaves lanceolate; apices subulate to acuminate, acute to obtuse; costae sub- percurrent to percurrent. |[[Dichelyma pallescens|Dichelyma pallescens]] |} </div></div><!-- -->{{#Taxon: name=Dichelyma |authority=Myrin |rank=genus |parent rank=family |synonyms= |basionyms= |family=Fontinalaceae |distribution=North America;Europe;Asia |reference=None |publication title=Kongl. Vetensk. Acad. Handl. |publication year=1833 |special status= |source xml=https://bibilujan@bitbucket.org/aafc-mbb/fna-fine-grained-xml.git/src/84153f6d59a0a91d69695978a64cee7560374f8e/V28/V28_764.xml |genus=Dichelyma |annulus prominence=rudimentary |apex shape=filiform-acuminate;acute;filiform-acuminate;acute;obtuse |axillary hair some measurement=100um;300um |base architecture or fixation=clasping |calyptra shape=long-cucullate |capsule location=emergent;emergent |capsule position=exserted |capsule prominence=immersed |capsule shape=cylindric;subcylindric;cylindric;subcylindric;oval-oblong;oval |cell shape=rectangular;quadrate |cell size=enlarged |costa architecture=long-excurrent |costa position=subpercurrent |endostome architecture=perfect;imperfect |initial position=abaxial |leaf arrangement=crowded;distant |leaf arrangement or vernation=conduplicate |leaf shape=elongate;keeled;lanceolate;linear-lanceolate |margin architecture or shape=serrulate;serrulate;entire |margin orientation=recurved |margin shape=plane |medial laminal cell shape=linear;linear-rhomboidal |operculum shape=long-rostrate;conic |perigonium position=lateral |rhizoid architecture=branched |seta architecture or shape=sheathing |seta atypical some measurement=15mm;20mm |seta some measurement=3mm;15mm |spore some measurement=10um;17um |stem orientation=pendent;prostrate |wall texture=firm |whole_organism growth form=plant |whole_organism reflectance=glossy |whole_organism size=small;large }}<!-- -->[[Category:Treatment]][[Category:Fontinalaceae]] Templates used on this page: Template:Fontinalaceae (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 Dichelyma.