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.
}}
|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-undefined" data-properties=""><b>Plants </b>gregarious, bulbiform, white to whitish green distally, brown proximally. <b>Stems</b> to 3 mm; hyalodermis absent, sclerodermis absent, central strand present; axillary hairs ca. 3–6 cells in length, proximal 2 cells firm-walled. <b>Leaves</b> appressed when dry, appressed or loosely involute distally, weakly spreading when moist; nearly circular to very broadly ovate, sometimes elliptic, adaxial surface deeply concave, ca. 1.5–2 mm; base not differentiated, proximal margins not differentiated; 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; apex broadly acute or occasionally rounded; costa thin, excurrent as a flexuose hyaline awn or occasionally percurrent or subpercurrent, adaxial epidermal cells forming a bulging adaxial ridge, adaxial cells short-rectangular, bulliform (bulging, thin-walled), in ca. 3–4 rows, adaxial outgrowths rare, lamelliform, rounded or serrate and papillose; 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; 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; 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; papillae absent, cell walls usually thin medially and thick-walled near apex, especially on the abaxial superficial walls, convex on both sides. <b>Specialized</b> asexual reproduction absent. <b>Sexual</b> condition monoicous (paroicous or autoicous); perichaetia terminal, interior leaves little differentiated. <b>Seta</b> 0.2–1.2 cm or very short (70–100 µm). <b>Capsule</b> stegocarpous or cleistocarpous, theca exerted, ovate-cylindric and often slightly curved, to 1–2 mm; or immersed, ovate and very shortly apiculate, ca. 0.7 mm, annulus absent or of 2–3 rows of persistent, vesiculose cells; operculum absent or short-rostrate; peristome teeth absent, rudimentary or 16, cleft to near base, occasionally perforate, ligulate, straight, to 125 µm. <b>Calyptra</b> cucullate. <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 <i>Stegonia</i> 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 <i>S. latifolia</i>) similar to that of the arctic <i>Hilpertia velenovskyi</i>, but smaller, proximal leaves similar to those of <i>Tortula acaulon</i>.</p><!--
--><p>1 Seta (2–)4–12 mm; capsule stegocarpous, exerted, ovate-cylindric, to 1–2 mm 1. <i>Stegonia latifolia</i></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://jpend@bitbucket.org/aafc-mbb/fna-data-curation.git/src/f6b125a955440c0872999024f038d74684f65921/coarse_grained_fna_xml/V27/V27_869.xml
|subfamily=Pottiaceae subfam. Pottioideae
|genus=Stegonia
}}<!--

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