View source for Dicranum acutifolium

{{Treatment/ID
|accepted_name=Dicranum acutifolium
|accepted_authority=(Lindberg & Arnell) C. E. O. Jensen in H. Weimarck
|publications={{Treatment/Publication
|title=in H. Weimarck, Förtekn. Skand. Växt., Moss. ed.
|place=2, 18. 1937,
}}
|basionyms={{Treatment/ID/Basionym
|name=Dicranum bergeri var. acutifolium
|authority=Lindberg & Arnell
|rank=variety
|publication_title=Kongl. Svenska Vetensk. Acad. Handl., n. s.
|publication_place=23(10): 79. 1890
}}
|synonyms=
|hierarchy=Dicranaceae;Dicranum;Dicranum acutifolium
|hierarchy_nav=<div class="higher-taxa"><div class="higher-taxon"><small>family</small>[[Dicranaceae]]</div><div class="higher-taxon"><small>genus</small>[[Dicranum]]</div><div class="higher-taxon"><small>species</small>[[Dicranum acutifolium]]</div></div>
|volume=Volume 27
|mention_page=page 400, 401, 410, 413
|treatment_page=page 411
}}<!--

--><span class="statement" id="st-d0_s0" data-properties="whole_organism coloration;whole_organism reflectance;whole_organism growth form;tuft density;tuft architecture or fragility"><b>Plants </b>in dense to loose tufts, light green to light-brown, dull.</span> <span class="statement" id="st-d0_s1" data-properties="stem some measurement;stem architecture;stem pubescence;rhizoid coloration"><b>Stems </b>1.5–7 cm, generally branched above, somewhat tomentose with reddish-brown rhizoids.</span> <span class="statement" id="st-d0_s2" data-properties="leaf orientation;leaf shape;leaf course;leaf shape;leaf shape;undulation quantity;distal part atypical length;distal part atypical length;distal part length;distal part width;margin shape;margin shape;margin shape"><b>Leaves </b>erect-spreading, slightly curled to ± straight when dry, usually with a few undulations in distal part, (3.5–) 5–8 (–10) mm × 0.5–1 mm, concave below, keeled above, sometimes margins ± involute, lanceolate, narrowly acute to acuminate;</span> <span class="statement" id="st-d0_s3" data-properties="margin architecture or shape">margins serrulate to serrate above;</span> <span class="statement" id="st-d0_s4" data-properties="lamina architecture;lamina architecture;region quantity;region architecture">laminae 1-stratose or with few 2-stratose regions on or near the distal margins;</span> <span class="statement" id="st-d0_s5" data-properties="costa architecture;costa quantity;base width;abaxial ridge presence;row quantity;adaxial epidermal layer variability;abaxial layer variability">costa percurrent to shortly excurrent, 1/6–1/4 the width of the leaves at base, smooth to slightly papillose above on abaxial surface, abaxial ridges absent, with a row of guide cells, two stereid bands extending to the apex, adaxial epidermal layer of cells not differentiated, the abaxial layer differentiated;</span> <span class="statement" id="st-d0_s6" data-properties="between cells cell-wall pubescence or shape">cell-walls between lamina cells not or slightly bulging;</span> <span class="statement" id="st-d0_s7" data-properties="">leaf cells smooth to weakly papillose above on abaxial surface;</span> <span class="statement" id="st-d0_s8" data-properties="leaf cell relief;cell architecture;cell variability">alar cells 2-stratose, differentiated, often extending to costa;</span> <span class="statement" id="st-d0_s9" data-properties="proximal laminal cell shape;proximal laminal cell relief;proximal laminal cell atypical length;proximal laminal cell atypical length;proximal laminal cell length;proximal laminal cell atypical width;proximal laminal cell atypical width;proximal laminal cell width">proximal laminal cells linear-rectangular, pitted, (22–) 41–60 (–90) × (5–) 6–8 (–12) µm; distal laminal cells short-rectangular, irregularly angled or rounded, not pitted, (7–) 12–20 (–32) × (4–) 8–9 (–14) µm. <b>Sexual</b> condition pseudomonoicous;</span> <span class="statement" id="st-d0_s10" data-properties="distal laminal cell shape;distal laminal cell shape;distal laminal cell shape;distal laminal cell relief;distal laminal cell atypical length;distal laminal cell atypical length;distal laminal cell length;distal laminal cell atypical width;distal laminal cell atypical width;distal laminal cell width;distal laminal cell reproduction;distal laminal cell reproduction;distal laminal cell height;stem rhizoid reproduction;plant reproduction">dwarf males on stem rhizoids of female plants;</span> <span class="statement" id="st-d0_s11" data-properties="interior perichaetial leaf shape;interior perichaetial leaf architecture or shape">interior perichaetial leaves abruptly short-acuminate, convolute-sheathing.</span> <span class="statement" id="st-d0_s12" data-properties="seta some measurement;seta architecture or arrangement or growth form;seta coloration"><b>Seta </b>1.2–2.5 cm, solitary, yellow to reddish yellow.</span> <span class="statement" id="st-d0_s13" data-properties="capsule some measurement;capsule course or shape;capsule orientation;capsule architecture;capsule shape;capsule coloration"><b>Capsule </b>2–2.7 mm, arcuate, inclined to horizontal, furrowed when dry, rarely slightly strumose, brown to reddish-brown;</span> <span class="statement" id="st-d0_s14" data-properties="operculum some measurement">operculum 1.5–2.5 mm.</span> <span class="statement" id="st-d0_s15" data-properties="spore some measurement"><b>Spores </b>14–28 µm.</span><!--

-->{{Treatment/Body
|phenology=Capsules mature summer.
|habitat=Somewhat calcareous soil, boulders, rock outcrops and cliff ledges, sometimes humus, rarely rotten logs
|elevation=700-2500 m
|distribution=Greenland;Alta.;B.C.;Man.;Nfld. and Labr. (Nfld.);N.W.T.;Nunavut;Ont.;Que.;Yukon;Alaska;Maine;Mont.;N.H.;N.Mex.;N.Y.;Wyo.;Europe;Asia
|discussion=<p>Dicranum acutifolium has been reported from Colorado by W. A. Weber (1973), but has been deleted from the flora (Weber, pers. comm.). It has also been reported from New Mexico, New York, and Wyoming by W. L. Peterson (1979). This arctic-alpine species is recognized by its erect-spreading leaves, slightly curled when dry, keeled and often weakly undulate above, lanceolate, narrowly acute to acuminate, by its percurrent to shortly excurrent costae, smooth to slightly papillose above, and by its leaf cross section that shows only the abaxial row of cells differentiated, a few 2-stratose marginal cells and the cell walls between lamina cells smooth to slightly bulging. Dicranum acutifolium has often been confused with D. fuscescens but the latter species has a longer, rougher subula that in leaf cross section in the distal half reveals very large and obvious papillae, compared to the smaller and less distinct ones in the former, and margins that are almost completely 2-stratose, while those of D. acutifolium are mostly 1-stratose. It has also been confused with 13. D. brevifolium and for distinctions see discussion thereunder.</p>
|tables=
|references=
}}<!--

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-->{{#Taxon:
name=Dicranum acutifolium
|authority=(Lindberg & Arnell) C. E. O. Jensen in H. Weimarck
|rank=species
|parent rank=genus
|synonyms=
|basionyms=Dicranum bergeri var. acutifolium
|family=Dicranaceae
|phenology=Capsules mature summer.
|habitat=Somewhat calcareous soil, boulders, rock outcrops and cliff ledges, sometimes humus, rarely rotten logs
|elevation=700-2500 m
|distribution=Greenland;Alta.;B.C.;Man.;Nfld. and Labr. (Nfld.);N.W.T.;Nunavut;Ont.;Que.;Yukon;Alaska;Maine;Mont.;N.H.;N.Mex.;N.Y.;Wyo.;Europe;Asia
|reference=None
|publication title=in H. Weimarck, Förtekn. Skand. Växt., Moss. ed.
|publication year=
|special status=
|source xml=https://bibilujan@bitbucket.org/aafc-mbb/fna-fine-grained-xml.git/src/84153f6d59a0a91d69695978a64cee7560374f8e/V27/V27_582.xml
|genus=Dicranum
|species=Dicranum acutifolium
|abaxial layer variability=differentiated
|abaxial ridge presence=absent
|adaxial epidermal layer variability=not differentiated
|base width=smooth;slightly papillose
|between cells cell-wall pubescence or shape=bulging
|capsule architecture=furrowed
|capsule coloration=brown;reddish-brown
|capsule course or shape=arcuate
|capsule orientation=inclined;horizontal
|capsule shape=strumose
|capsule some measurement=2mm;2.7mm
|cell architecture=2-stratose
|cell variability=differentiated
|costa architecture=percurrent;shortly excurrent
|costa quantity=1/6;1/4
|distal laminal cell atypical length=20um;32um
|distal laminal cell atypical width=9um;14um
|distal laminal cell height=dwarf
|distal laminal cell length=12um;20um
|distal laminal cell relief=not pitted
|distal laminal cell reproduction=pseudomonoicous;sexual
|distal laminal cell shape=rounded;angled;short-rectangular
|distal laminal cell width=8um;9um
|distal part atypical length=8mm;10mm
|distal part length=5mm;8mm
|distal part width=0.5mm;1mm
|interior perichaetial leaf architecture or shape=convolute-sheathing
|interior perichaetial leaf shape=short-acuminate
|lamina architecture=with few 2-stratose regions;1-stratose
|leaf cell relief=smooth;weakly papillose
|leaf course=straight
|leaf orientation=erect-spreading
|leaf shape=keeled;concave;curled
|margin architecture or shape=serrulate;serrate
|margin shape=narrowly acute;acuminate
|operculum some measurement=1.5mm;2.5mm
|plant reproduction=female
|proximal laminal cell atypical length=60um;90um
|proximal laminal cell atypical width=8um;12um
|proximal laminal cell length=41um;60um
|proximal laminal cell relief=pitted
|proximal laminal cell shape=linear-rectangular
|proximal laminal cell width=6um;8um
|region architecture=2-stratose
|region quantity=few
|rhizoid coloration=reddish-brown
|row quantity=2
|seta architecture or arrangement or growth form=solitary
|seta coloration=yellow;reddish yellow
|seta some measurement=1.2cm;2.5cm
|spore some measurement=14um;28um
|stem architecture=branched
|stem pubescence=tomentose
|stem rhizoid reproduction=male
|stem some measurement=1.5cm;7cm
|tuft architecture or fragility=loose
|tuft density=dense
|undulation quantity=few
|whole_organism coloration=light green;light-brown
|whole_organism growth form=plant
|whole_organism reflectance=dull
}}<!--

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