View source for Atrichum altecristatum

{{Treatment/ID
|accepted_name=Atrichum altecristatum
|accepted_authority=(Renauld & Cardot) B. B. Smyth & L. C. D. Smyth
|publications={{Treatment/Publication
|title=Trans. Kansas Acad. Sci.
|place=23/24: 284. 1911,
}}
|basionyms={{Treatment/ID/Basionym
|name=Atrichum undulatum var. altecristatum
|authority=Renauld & Cardot
|rank=variety
|publication_title=Bot. Gaz.
|publication_place=15: 58. 1890
}}
|synonyms={{Treatment/ID/Synonym
|name=Atrichum selwynii var. altecristatum
|authority=(Renauld & Cardot) Nyholm
|rank=variety
}} {{Treatment/ID/Synonym
|name=Atrichum undulatum var. allegheniense
|authority=(Jennings) Jennings
|rank=variety
}}
|hierarchy=Polytrichaceae;Atrichum;Atrichum altecristatum
|hierarchy_nav=<div class="higher-taxa"><div class="higher-taxon"><small>family</small>[[Polytrichaceae]]</div><div class="higher-taxon"><small>genus</small>[[Atrichum]]</div><div class="higher-taxon"><small>species</small>[[Atrichum altecristatum]]</div></div>
|volume=Volume 27
|mention_page=page 148, 149, 151, 154
|treatment_page=page 153
}}<!--

--><span class="statement" id="st-d0_s0" data-properties="whole_organism size;whole_organism coloration;whole_organism coloration;whole_organism growth form"><b>Plants </b>small to medium-sized, light to dark green, brown proximally with age.</span> <span class="statement" id="st-d0_s1" data-properties="stem some measurement"><b>Stems </b>1–3 cm.</span> <span class="statement" id="st-d0_s2" data-properties="leaf length;leaf width;leaf shape;leaf shape;leaf shape;leaf shape;leaf shape;apex shape;leaf position;leaf shape"><b>Leaves </b>2–8 × 0.7–1.5 mm, keeled and concave, rarely almost plane, rather narrowly lanceolate to lingulate, more or less undulate with rows of abaxial teeth on the undulations, the apex acute or sometimes proximal leaves obtuse;</span> <span class="statement" id="st-d0_s3" data-properties="costa architecture;costa position">costa percurrent or subpercurrent with abaxial teeth near apex;</span> <span class="statement" id="st-d0_s4" data-properties="lamella atypical quantity;lamella quantity;lamella orientation;lamella atypical quantity;lamella quantity;bud height">lamellae 4–6 (–8), laxly spreading, 4–6 (–9) cells high;</span> <span class="statement" id="st-d0_s5" data-properties="papilla size;papilla relief;papilla relief">median leaf cells 24-28 µm wide, rounded to ± regularly hexagonal, rather thick-walled, strongly collenchymatous with trigones, smooth or occasionally with minute, verrucose or striate papillae mainly on abaxial surface.</span> <span class="statement" id="st-d0_s6" data-properties="leaf bud width;leaf bud shape;leaf bud architecture;leaf bud architecture;leaf bud architecture or pubescence or relief;leaf bud architecture or pubescence or relief;leaf bud reproduction;whole-organism reproduction;shoot reproduction;shoot reproduction;shoot reproduction"><b>Sexual </b>condition polygamous, some shoots apparently unisexual males or females, others with both sexes;</span> <span class="statement" id="st-d0_s7" data-properties="perigonium prominence;inner perigonial bract size;inner perigonial bract shape;inner perigonial bract shape">perigonia inconspicuous, the outer perigonial bracts resembling stem-leaves but with a broader base, the inner small, ovate or suborbicular.</span> <span class="statement" id="st-d0_s8" data-properties="seta quantity;seta some measurement;seta orientation"><b>Seta </b>1–3 per perichaetium, 1–3.5 cm, erect.</span> <span class="statement" id="st-d0_s9" data-properties="capsule length;capsule width;capsule shape;capsule course;capsule orientation;capsule course;capsule orientation"><b>Capsule </b>2–7 × 0.5–0.8 mm, cylindric, usually somewhat curved and inclined, sometimes straight and erect;</span> <span class="statement" id="st-d0_s10" data-properties="operculum some measurement">operculum 2–3 mm.</span> <span class="statement" id="st-d0_s11" data-properties="spore some measurement"><b>Spores </b>9–21 µm.</span><!--

-->{{Treatment/Body
|phenology=Capsules mature spring–fall (Mar–Oct).
|habitat=Soil banks along roads, trails, often on hummocks in clearings in woodlands, open or semishaded conditions
|elevation=usually low elevations
|distribution=Man.;N.B.;Nfld. and Labr. (Nfld.);N.S.;Ont.;P.E.I.;Que.;Ark.;Del.;D.C.;Ill.;Ind.;Iowa;Kans.;Ky.;Maine;Md.;Mich.;Minn.;Mo.;Nebr.;N.H.;N.Y.;N.C.;Ohio;Okla.;Pa.;S.Dak.;Tenn.;Va.;W.Va.;Wis.
|discussion=<p>Atrichum altecristatum is a common and widespread species, particularly in northcentral United States. It is distinguished from A. angustatum by the lamellae 4–6, and 4–6 cells high (against 6–9 lamellae, up to 15 cells high in A. angustatum), and leaf cells 24–28 µm in longest dimension, collenchymatous, with evident trigones (as opposed to cells smaller and subquadrate in A. angustatum, bulging mammillose on the adaxial surface). The difference in sexuality is more difficult to demonstrate, since most plants in a colony may appear female, with only a few shoots bearing a male inflorescence followed by a female inflorescence and sporophyte on the same stem about a centimeter above the male. As a result, the species is monoicous, but functionally dioicous. The taxon known as A. crispum var. molle (Holzinger) Frye evidently belongs here (R. R. Ireland 1969).</p>
|tables=
|references=
}}<!--

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-->{{#Taxon:
name=Atrichum altecristatum
|authority=(Renauld & Cardot) B. B. Smyth & L. C. D. Smyth
|rank=species
|parent rank=genus
|synonyms=Atrichum selwynii var. altecristatum;Atrichum undulatum var. allegheniense
|basionyms=Atrichum undulatum var. altecristatum
|family=Polytrichaceae
|phenology=Capsules mature spring–fall (Mar–Oct).
|habitat=Soil banks along roads, trails, often on hummocks in clearings in woodlands, open or semishaded conditions
|elevation=usually low elevations
|distribution=Man.;N.B.;Nfld. and Labr. (Nfld.);N.S.;Ont.;P.E.I.;Que.;Ark.;Del.;D.C.;Ill.;Ind.;Iowa;Kans.;Ky.;Maine;Md.;Mich.;Minn.;Mo.;Nebr.;N.H.;N.Y.;N.C.;Ohio;Okla.;Pa.;S.Dak.;Tenn.;Va.;W.Va.;Wis.
|reference=None
|publication title=Trans. Kansas Acad. Sci.
|publication year=
|special status=
|source xml=https://bibilujan@bitbucket.org/aafc-mbb/fna-fine-grained-xml.git/src/84153f6d59a0a91d69695978a64cee7560374f8e/V27/V27_189.xml
|genus=Atrichum
|species=Atrichum altecristatum
|apex shape=acute
|bud height=high
|capsule course=straight;curved
|capsule length=2mm;7mm
|capsule orientation=erect;inclined
|capsule shape=cylindric
|capsule width=0.5mm;0.8mm
|costa architecture=percurrent
|costa position=subpercurrent
|inner perigonial bract shape=suborbicular;ovate
|inner perigonial bract size=small
|lamella atypical quantity=6;9
|lamella orientation=spreading
|lamella quantity=4;6
|leaf bud architecture=collenchymatous;thick-walled
|leaf bud architecture or pubescence or relief=occasionally;smooth
|leaf bud reproduction=sexual
|leaf bud shape=rounded;more or less regularly hexagonal
|leaf bud width=24um;28um
|leaf length=2mm;8mm
|leaf position=proximal
|leaf shape=obtuse;undulate;rather narrowly lanceolate;lingulate
|leaf width=0.7mm;1.5mm
|operculum some measurement=2mm;3mm
|papilla relief=striate;verrucose
|papilla size=minute
|perigonium prominence=inconspicuous
|seta orientation=erect
|seta quantity=1;3
|seta some measurement=1cm;3.5cm
|shoot reproduction=female;male;unisexual
|spore some measurement=9um;21um
|stem some measurement=1cm;3cm
|whole-organism reproduction=polygamous
|whole_organism coloration=brown;light;dark green
|whole_organism growth form=plant
|whole_organism size=small;medium-sized
}}<!--

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