View source for Stegonia

{{Treatment/ID
|accepted_name=Stegonia
|accepted_authority=Venturi
|publications={{Treatment/Publication
|title=Rev. Bryol.
|place=10: 96. 1883 ,
}}
|basionyms=
|synonyms={{Treatment/ID/Synonym
|name=Pottia sect. Stegonia
|authority=(Venturi) Müller Hal.
|rank=section
}}
|hierarchy=Pottiaceae;Pottiaceae subfam. Pottioideae;Stegonia
|hierarchy_nav=<div class="higher-taxa"><div class="higher-taxon"><small>family</small>[[Pottiaceae]]</div><div class="higher-taxon"><small>subfamily</small>[[Pottiaceae subfam. Pottioideae]]</div><div class="higher-taxon"><small>genus</small>[[Stegonia]]</div></div>
|etymology=Greek stego, cover, alluding to concave, protecting leaves
|volume=Volume 27
|mention_page=page 480, 599, 600, 604
|treatment_page=page 603
}}<!--

--><span class="statement" id="st-d0_s0" data-properties="whole_organism growth form;whole_organism architecture or shape;whole_organism coloration;whole_organism coloration;whole_organism growth form"><b>Plants </b>gregarious, bulbiform, white to whitish green distally, brown proximally.</span> <span class="statement" id="st-d0_s1" data-properties="stem some measurement"><b>Stems </b>to 3 mm;</span> <span class="statement" id="st-d0_s2" data-properties="hyalodermi presence;scleroderm presence;central strand presence">hyalodermis absent, sclerodermis absent, central strand present;</span> <span class="statement" id="st-d0_s3" data-properties="axillary hair quantity;proximal cell quantity;cell architecture">axillary hairs ca. 3–6 cells in length, proximal 2 cells firm-walled.</span> <span class="statement" id="st-d0_s4" data-properties=""><b>Leaves </b>appressed when dry, appressed or loosely involute distally, weakly spreading when moist;</span> <span class="statement" id="st-d0_s5" data-properties="leaf fixation or orientation;leaf fixation or orientation;leaf shape or vernation;leaf orientation;leaf arrangement or shape;whole-organism shape;whole-organism shape;whole-organism arrangement or shape;adaxial surface shape;adaxial surface some measurement">nearly circular to very broadly ovate, sometimes elliptic, adaxial surface deeply concave, ca. 1.5–2 mm;</span> <span class="statement" id="st-d0_s6" data-properties="base variability;proximal margin variability">base not differentiated, proximal margins not differentiated;</span> <span class="statement" id="st-d0_s7" data-properties="cell margin orientation;cell margin shape or vernation;cell margin shape;cell margin orientation;cell margin architecture or shape;cell margin architecture or shape;cell margin position or shape;cell margin quantity;leaf coloration;cell shape;cell architecture">distal margins broadly recurved to revolute, occasionally plane or weakly incurved, commonly serrulate near apex, occasionally entire, distal 1/4–1/3 of leaf usually hyaline, of rhomboid thick-walled cells;</span> <span class="statement" id="st-d0_s8" data-properties="apex shape;apex shape">apex broadly acute or occasionally rounded;</span> <span class="statement" id="st-d0_s9" data-properties="costa width;costa architecture;awn course;awn coloration;awn course;awn coloration;adaxial epidermal-cell architecture;adaxial epidermal-cell position;adaxial epidermal-cell course;adaxial epidermal-cell coloration;adaxial epidermal-cell position;adaxial ridge pubescence or shape;adaxial cell shape;row quantity;adaxial outgrowth quantity;adaxial outgrowth shape;adaxial outgrowth shape;adaxial outgrowth shape;adaxial outgrowth relief">costa thin, excurrent as a flexuose hyaline awn or occasionally percurrent or subpercurrent, adaxial epidermal-cells forming a bulging adaxial ridge, adaxial cells shortrectangular, bulliform (bulging, thin-walled), in ca. 3–4 rows, adaxial outgrowths rare, lamelliform, rounded or serrate and papillose;</span> <span class="statement" id="st-d0_s10" data-properties="transverse-section shape;adaxial epidermis presence;cell shape;band presence;guide cell quantity;layer quantity;hydroid strand presence;hydroid strand size;band presence;band shape;abaxial epidermis presence;abaxial epidermis presence">transverse-section round, adaxial epidermis present, of bulliform cells, adaxial stereid band absent, guide cells 2 (often absent distally) in 1 layer, hydroid strand present, large (occasionally absent distally), abaxial stereid band present (occasionally substereid), round in section, abaxial epidermis absent distally, present proximally;</span> <span class="statement" id="st-d0_s11" data-properties="proximal cell variability;proximal cell shape;proximal cell pubescence or shape;proximal cell variability;proximal cell variability;proximal cell width;proximal cell quantity;proximal cell quantity;wall width">proximal cells differentiated across leaf, rectangular, occasionally bulging, little differentiated or to 30 µm wide, to 4: 1, walls of proximal cells often somewhat thicker than distal cells;</span> <span class="statement" id="st-d0_s12" data-properties="distal medial cell shape;distal medial cell shape;distal medial cell shape;distal medial cell shape;distal medial cell shape;distal medial cell coloration;distal medial cell width;distal medial cell quantity;distal medial cell quantity;distal medial cell architecture">distal medial cells rhomboid or hexagonal, grading to elongate rhomboid or hexagonal distally, often hyaline distally, 13–22 µm wide, 2–3: 1, 1-stratose;</span> <span class="statement" id="st-d0_s13" data-properties="distal medial cell shape;distal medial cell shape;distal medial cell shape;distal medial cell shape;distal medial cell shape;distal medial cell coloration;distal medial cell width;distal medial cell quantity;papilla presence">papillae absent, cell-walls usually thin medially and thick-walled near apex, especially on the abaxial superficial walls, convex on both sides.</span> <span class="statement" id="st-d0_s14" data-properties=""><b>Specialized </b>asexual reproduction absent.</span> <span class="statement" id="st-d0_s15" data-properties="cell-wall width;cell-wall architecture;cell-wall shape;cell-wall development;cell-wall reproduction;cell-wall presence;cell-wall reproduction;cell-wall reproduction"><b>Sexual </b>condition monoicous (paroicous or autoicous);</span> <span class="statement" id="st-d0_s16" data-properties="perichaetium position or structure subtype;interior leaf variability">perichaetia terminal, interior leaves little differentiated.</span> <span class="statement" id="st-d0_s17" data-properties="seta some measurement;seta height or length or size"><b>Seta </b>0.2–1.2 cm or very short (70–100 µm).</span> <span class="statement" id="st-d0_s18" data-properties="capsule dehiscence;capsule dehiscence"><b>Capsule </b>stegocarpous or cleistocarpous, theca exerted, ovate-cylindric and often slightly curved, to 1–2 mm;</span> <span class="statement" id="st-d0_s19" data-properties="theca shape;theca course;theca some measurement;theca prominence;theca shape;whole-organism architecture or shape;whole-organism some measurement;annulus presence;annulus quantity;row quantity;cell duration;cell architecture">or immersed, ovate and very shortly apiculate, ca. 0.7 mm, annulus absent or of 2–3 rows of persistent, vesiculose cells;</span> <span class="statement" id="st-d0_s20" data-properties="operculum presence;operculum shape">operculum absent or short-rostrate;</span> <span class="statement" id="st-d0_s21" data-properties="peristome tooth presence;peristome tooth prominence;peristome tooth quantity;peristome tooth architecture or shape;peristome tooth architecture;peristome tooth architecture;peristome tooth course;peristome tooth some measurement;calyptra shape">peristome teeth absent, rudimentary or 16, cleft to near base, occasionally perforate, ligulate, straight, to 125 µm. <b>Calyptra</b> cucullate.</span> <span class="statement" id="st-d0_s22" data-properties="spore some measurement;spore position or shape;spore coloration;spore coloration"><b>Spores </b>20–45 µm. KOH distal laminal color reaction yellow.</span><!--

-->{{Treatment/Body
|distribution=w North America;Mexico;Europe;Asia;Africa;Antarctic
|discussion=<p>Species 3 (2 in the flora).</p><!--
--><p>The capsules of Stegonia exhibit a reduction series (R. H. Zander 1993): one species is peristomate, another cleistocarpous, while the third, of northern Africa, is stegocarpous but eperistomate. Both species in the flora area have perichaetial leaves with a leaf apex of hyaline, elongate, rectangular cells (this variable in S. latifolia) similar to that of the arctic Hilpertia velenovskyi, but smaller, proximal leaves similar to those of Tortula acaulon.</p><!--
--><p>1 Seta (2–)4–12 mm; capsule stegocarpous, exerted, ovate-cylindric, to 1–2 mm 1. Stegonia latifolia</p>
|tables=
|references=
}}<!--

--><div class="treatment-key">
==Key==
<div class="treatment-key-group">
  
{| class="wikitable fna-keytable"
|-id=key-0-1
|1
|Seta (2-)4-12 mm; capsule stegocarpous, exerted, ovate-cylindric, to 1-2 mm.
|[[Stegonia latifolia|Stegonia latifolia]]
|-id=key-0-1
|1
|Seta 0.07-0.1 mm; capsule cleistocarpous, immersed, ovate, ca. 0.7 mm.
|[[Stegonia hyalinotricha|Stegonia hyalinotricha]]
|}
</div></div><!--

-->{{#Taxon:
name=Stegonia
|author=Richard H. Zander
|authority=Venturi
|rank=genus
|parent rank=subfamily
|synonyms=Pottia sect. Stegonia
|basionyms=
|family=Pottiaceae
|distribution=w North America;Mexico;Europe;Asia;Africa;Antarctic
|reference=None
|publication title=Rev. Bryol.
|publication year=
|special status=
|source xml=https://bibilujan@bitbucket.org/aafc-mbb/fna-fine-grained-xml.git/src/84153f6d59a0a91d69695978a64cee7560374f8e/V27/V27_869.xml
|subfamily=Pottiaceae subfam. Pottioideae
|genus=Stegonia
|abaxial epidermis presence=absent;absent
|adaxial cell shape=bulliform
|adaxial epidermal-cell architecture=percurrent
|adaxial epidermal-cell coloration=hyaline
|adaxial epidermal-cell course=flexuose
|adaxial epidermal-cell position=subpercurrent;subpercurrent
|adaxial epidermis presence=absent
|adaxial outgrowth quantity=rare
|adaxial outgrowth relief=papillose
|adaxial outgrowth shape=serrate;rounded;lamelliform
|adaxial ridge pubescence or shape=bulging
|adaxial surface shape=concave
|adaxial surface some measurement=1.5mm;2mm
|annulus presence=absent
|annulus quantity=of 2;3 rows
|apex shape=rounded;acute
|awn coloration=hyaline;hyaline
|awn course=flexuose;flexuose
|axillary hair quantity=3;6
|band presence=absent;absent
|band shape=round
|base variability=not differentiated
|calyptra shape=cucullate
|capsule dehiscence=cleistocarpous;stegocarpous
|cell architecture=vesiculose;thick-walled;firm-walled
|cell duration=persistent
|cell margin architecture or shape=entire;serrulate
|cell margin orientation=incurved;recurved
|cell margin position or shape=distal
|cell margin quantity=1/4;1/3
|cell margin shape=plane
|cell margin shape or vernation=revolute
|cell shape=bulliform;rhomboid
|cell-wall architecture=thick-walled
|cell-wall development=specialized
|cell-wall presence=absent
|cell-wall reproduction=monoicous;sexual;asexual
|cell-wall shape=convex
|cell-wall width=thin
|central strand presence=absent
|costa architecture=excurrent
|costa width=thin
|distal medial cell architecture=1-stratose
|distal medial cell coloration=hyaline;hyaline
|distal medial cell quantity=2;3
|distal medial cell shape=hexagonal;rhomboid;elongate;hexagonal;rhomboid;hexagonal;rhomboid;elongate;hexagonal;rhomboid
|distal medial cell width=13um;22um
|guide cell quantity=2
|hyalodermi presence=absent
|hydroid strand presence=absent
|hydroid strand size=large
|interior leaf variability=differentiated
|layer quantity=1
|leaf arrangement or shape=circular
|leaf coloration=hyaline
|leaf fixation or orientation=appressed;appressed
|leaf orientation=spreading
|leaf shape or vernation=involute
|operculum presence=absent
|operculum shape=short-rostrate
|papilla presence=absent
|perichaetium position or structure subtype=terminal
|peristome tooth architecture=ligulate;perforate
|peristome tooth architecture or shape=cleft
|peristome tooth course=straight
|peristome tooth presence=absent
|peristome tooth prominence=rudimentary
|peristome tooth quantity=16
|peristome tooth some measurement=0um;125um
|proximal cell pubescence or shape=bulging
|proximal cell quantity=1;0;4
|proximal cell shape=rectangular
|proximal cell variability=0-30 um;differentiated;differentiated
|proximal cell width=wide
|proximal margin variability=not differentiated
|row quantity=2;3
|scleroderm presence=absent
|seta height or length or size=short
|seta some measurement=0.2cm;1.2cm
|spore coloration=yellow;laminal
|spore position or shape=distal
|spore some measurement=20um;45um
|stem some measurement=0mm;3mm
|theca course=curved
|theca prominence=immersed
|theca shape=ovate;ovate-cylindric
|theca some measurement=1mm;2mm
|transverse-section shape=round
|wall width=often somewhat thicker
|whole-organism architecture or shape=apiculate
|whole-organism arrangement or shape=elliptic
|whole-organism shape=ovate;circular to very
|whole-organism some measurement=0.7
|whole_organism architecture or shape=bulbiform
|whole_organism coloration=brown;white;whitish green distally
|whole_organism growth form=plant;gregarious
}}<!--

-->[[Category:Treatment]][[Category:Pottiaceae subfam. Pottioideae]]