View source for Atrichum selwynii

{{Treatment/ID
|accepted_name=Atrichum selwynii
|accepted_authority=Austin
|publications={{Treatment/Publication
|title=Bot. Gaz.
|place=2: 95. 1877,
}}
|basionyms=
|synonyms={{Treatment/ID/Synonym
|name=Atrichum rosulatum
|authority=Müller Hal.
|rank=species
}}
|hierarchy=Polytrichaceae;Atrichum;Atrichum selwynii
|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 selwynii]]</div></div>
|volume=Volume 27
|mention_page=page 148, 149
|treatment_page=page 151
}}<!--

--><span class="statement" id="st-d0_s0" data-properties="whole_organism size;whole_organism arrangement;whole_organism coloration;whole_organism coloration;whole_organism growth form"><b>Plants </b>small to medium-sized, often distinctly rosulate, light to dark green, brown proximally with age.</span> <span class="statement" id="st-d0_s1" data-properties="stem some measurement"><b>Stems </b>1–4 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;row orientation or shape;base fusion;apex shape;apex shape;leaf margin shape;tooth arrangement;tooth quantity;tooth shape"><b>Leaves </b>2.5–8.5 × 1–2 mm, lingulate to lanceolate, ovatelanceolate near base of stem, plane to somewhat keeled and concave, often with oblique rows of teeth on undulations on abaxial surface, the teeth often with bases united, the apex acute or sometimes obtuse, the leaf margins irregularly toothed, the teeth crowded, double or sometimes single, rarely triple-toothed;</span> <span class="statement" id="st-d0_s3" data-properties="costa architecture;costa architecture;costa architecture or pubescence or relief;costa architecture or pubescence or relief;leaf position">costa percurrent or ending a few cells below the apex, smooth or with teeth on abaxial surface near apex, seldom extending below leaf middle;</span> <span class="statement" id="st-d0_s4" data-properties="lamella quantity;lamella orientation;lamella atypical quantity;lamella quantity;bud height;lower bud prominence;lower bud quantity;bud height">lamellae 2–6, laxly spreading, 8–12 (–14) cells high, or at times lower and inconspicuous, 2–5 cells high;</span> <span class="statement" id="st-d0_s5" data-properties="trigone size">median lamina cells 27–40 (–48) µm wide, hexagonal, occasionally irregularly angled or rounded, rather thin-walled to firm, collenchymatous with small trigones.</span> <span class="statement" id="st-d0_s6" data-properties="lamina bud width;lamina bud width;lamina bud shape;lamina bud shape;lamina bud shape;lamina bud architecture;lamina bud texture;lamina bud architecture;lamina bud reproduction;lamina bud reproduction"><b>Sexual </b>condition dioicous;</span> <span class="statement" id="st-d0_s7" data-properties="whole_organism reproduction;whole_organism size;whole_organism size;whole_organism growth form;perigonial bract size;perigonial bract shape;perigonial bract shape">male plants as large or larger than females, perigonial bracts small, ovate or suborbicular, often more than one bud per plant.</span> <span class="statement" id="st-d0_s8" data-properties="seta atypical quantity;seta quantity;seta some measurement;seta orientation;seta course"><b>Seta </b>1–3 (–8) per perichaetium, to 5 cm, erect to slightly flexuose.</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>2–7.5 × 0.5–1 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>10–19 µm.</span><!--

-->{{Treatment/Body
|phenology=Capsules mature spring–late summer (Mar–Sept).
|habitat=Soil, open and shaded habitats, bare roadside banks, overturned tree roots
|elevation=low to high elevations
|distribution=Alta.;B.C.;Man.;N.W.T.;Sask.;Alaska;Ariz.;Calif.;Colo.;Idaho;Mont.;N.Mex.;Oreg.;S.Dak.;Utah;Wash.;Wyo.;Central America (Guatemala)
|discussion=<p>Atrichum selwynii is a common species largely restricted to western North America. It is easily recognized by the rosulate habit, the characteristic leaf border, with teeth irregular and crowded near the leaf apices, large, thin-walled leaf cells (to 48 µm wide), and numerous sporophytes per perichaetium. E. Nyholm (1971) treated A. altecristatum as a variety of A. selwynii, but A. altecristatum is monoicous and exclusively eastern. T. C. Frye (1937) combined A. selwynii and A. altecristatum, as A. undulatum var. selwynii (Austin) Frye. The easternmost outpost of A. selwynii is in the Black Hills of South Dakota, in company with other western mosses. Plants from the Pacific Coast Ranges with low and inconspicuous lamellae, 2–5 cells high, were referred by Frye (1910) to A. undulatum, part of his overly broad concept of this species, but were recognized by W. C. Steere et al. (1954) as clearly not that species. Plants of A. selwynii from Rocky populations typically have lamellae 8–12 cells high and higher.</p>
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-->{{#Taxon:
name=Atrichum selwynii
|authority=Austin
|rank=species
|parent rank=genus
|synonyms=Atrichum rosulatum
|basionyms=
|family=Polytrichaceae
|phenology=Capsules mature spring–late summer (Mar–Sept).
|habitat=Soil, open and shaded habitats, bare roadside banks, overturned tree roots
|elevation=low to high elevations
|distribution=Alta.;B.C.;Man.;N.W.T.;Sask.;Alaska;Ariz.;Calif.;Colo.;Idaho;Mont.;N.Mex.;Oreg.;S.Dak.;Utah;Wash.;Wyo.;Central America (Guatemala)
|reference=None
|publication title=Bot. Gaz.
|publication year=
|special status=
|source xml=https://bibilujan@bitbucket.org/aafc-mbb/fna-fine-grained-xml.git/src/84153f6d59a0a91d69695978a64cee7560374f8e/V27/V27_187.xml
|genus=Atrichum
|species=Atrichum selwynii
|apex shape=obtuse;acute
|base fusion=united
|bud height=high;high
|capsule course=straight;curved
|capsule length=2mm;7.5mm
|capsule orientation=erect;inclined
|capsule shape=cylindric
|capsule width=0.5mm;1mm
|costa architecture=ending a few cells;percurrent
|costa architecture or pubescence or relief=with teeth;smooth
|lamella atypical quantity=12;14
|lamella orientation=spreading
|lamella quantity=8;12
|lamina bud architecture=collenchymatous;thin-walled
|lamina bud reproduction=dioicous;sexual
|lamina bud shape=rounded;angled;hexagonal
|lamina bud texture=firm
|lamina bud width=27um;40um
|leaf length=2.5mm;8.5mm
|leaf margin shape=toothed
|leaf position=middle
|leaf shape=concave;keeled;plane to somewhat;ovatelanceolate;lingulate;lanceolate
|leaf width=1mm;2mm
|lower bud prominence=inconspicuous
|lower bud quantity=2;5
|operculum some measurement=2mm;3mm
|perigonial bract shape=suborbicular;ovate
|perigonial bract size=small
|row orientation or shape=oblique
|seta atypical quantity=3;8
|seta course=flexuose
|seta orientation=erect
|seta quantity=1;3
|seta some measurement=0cm;5cm
|spore some measurement=10um;19um
|stem some measurement=1cm;4cm
|tooth arrangement=crowded
|tooth quantity=single
|tooth shape=triple-toothed
|trigone size=small
|whole_organism arrangement=rosulate
|whole_organism coloration=brown;light;dark green
|whole_organism growth form=plant;plant
|whole_organism reproduction=male
|whole_organism size=larger than females;large;small;medium-sized
}}<!--

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