View source for Ceratodon

{{Treatment/ID
|accepted_name=Ceratodon
|accepted_authority=Bridel
|publications={{Treatment/Publication
|title=Bryol. Univ.
|place=1: 480. 1826 ,
}}
|basionyms=
|synonyms=
|hierarchy=Ditrichaceae;Ceratodon
|hierarchy_nav=<div class="higher-taxa"><div class="higher-taxon"><small>family</small>[[Ditrichaceae]]</div><div class="higher-taxon"><small>genus</small>[[Ceratodon]]</div></div>
|etymology=Greek keratos, horn, and odon, tooth, alluding to peristome teeth forked like goat horns
|volume=Volume 27
|mention_page=page 443, 444, 458
|treatment_page=page 445
}}<!--

--><span class="statement" id="st-undefined" data-properties=""><b>Plants </b>in loose to dense tufts, turfs, or mats, green to dark green, brownish green, light green, or yellow-green, often tinged reddish brown or purple. <b>Stems</b> (0.2–)1–3(–4) cm, often branched; rhizoids at base, papillose. <b>Leaves</b> erect-patent, contorted or somewhat crisped, rarely straight when dry, lanceolate, ovate-lanceolate, or triangular-lanceolate, or elliptical to ovate and somewhat concave, margins recurved to near apex, rarely plane, irregularly serrate or smooth distally; costa sub-percurrent to excurrent, sometimes as a long, smooth awn, 1 row of guide cells, two stereid bands, hydroid cells present between guide cells and abaxial stereids; medial laminal cells of somewhat uneven shape and size across leaf, more or less quadrate or short-rectangular, often irregularly angled or rarely rounded, non-pitted. <b>Specialized</b> asexual reproduction absent or as multicellular filamentous propagules with thin walls scattered along the stems or occasionally as rhizome nodules. <b>Sexual</b> condition dioicous; male and female plants about the same size; perigonial leaves ovate, concave, short-acuminate or rarely long-acuminate in well-developed plants; perichaetial leaves convolute-sheathing, abruptly subulate to gradually acuminate. <b>Seta</b> red, purplish, yellow, or yellow-orange, elongate, twisted when dry, erect. <b>Capsule</b> erect to inclined or horizontal, exserted, dark red to reddish or purplish brown, to pale brown, pale yellow or yellow-orange, oblong-ovoid to oblong-cylindric or cylindric, often somewhat asymmetric and deeply furrowed, smooth to strongly sulcate when dry, usually strumose; annulus of 2–3 rows of large, deciduous, revoluble cells; operculum conic to long-conic, straight; peristome single, teeth 16, split nearly to their base into 2 filiform segments free to united at their nodes basally, 5–18 articulations, basal membrane present, finely papillose to spinulose-papillose. <b>Calyptra</b> cucullate. <b>Spores</b> globose, smooth to finely papillose.</span><!--

-->{{Treatment/Body
|distribution=Worldwide.
|discussion=<p>Species 3 (2 in the flora).</p><!--
--><p>Historically, <i>Ceratodon</i> has been a troubling genus. Taxonomic interpretations, especially with respect to <i>C. purpureus</i> in the broad sense, have varied widely, mainly because of the high degree of environmental and suspected genetic variation across its range. J. S. Burley and N. M. Pritchard (1990) provided the most thorough treatment of <i>Ceratodon</i> to date, reducing the number of species to four and subspecies of <i>C. purpureus</i> to three. One of their species, C. conicus, is treated here as a subspecies of <i>C. purpureus</i>, based on the apparent gradation and reduction of all of the characters that they used in their treatment. However, there remains a great need for a detailed study of this genus within North America.</p>
|tables=
|references={{Treatment/Reference
|id=burley1990a
|text=Burley, J. S. and N. M. Pritchard. 1990. Revision of the genus Ceratodon (Bryophyta). Harvard Pap. Bot. 2: 17–76.
}}{{Treatment/Reference
|id=snider1994a
|text=Snider, J. A. 1994. Ceratodon. In: A. J. Sharp, et al., eds. The moss flora of Mexico. Mem. New York Bot. Gard. 69: 103.
}}
}}<!--

--><div class="treatment-key">
==Key==
<div class="treatment-key-group">
  
{| class="wikitable fna-keytable"
|-id=key-0-1
|1
|Vegetative leaves elliptic to ovate-lanceolate, concave, obtuse; distal laminal cells usually 12-16 mm, sometimes longer; leaf margins plane to weakly recurved and usually entire; most costa sub-percurrent; capsule ovate to ovate-cylindrical, about 1 mm; spores usually19-21 µm; restricted to Arctic regions.
|[[Ceratodon heterophyllus|Ceratodon heterophyllus]]
|-id=key-0-1
|1
|Vegetative leaves usually lanceolate to ovate-lanceolate, acute to short-acuminate; distal laminal cells usually 8-12 mm; leaf margins recurved and usually toothed distally; costa percurrent to long-excurrent; capsule ovate-cylindrical to cylindrical, usually longer, to 3 mm; spores usually 11-14 µm; widespread.
|[[Ceratodon purpureus|Ceratodon purpureus]]
|}
</div></div><!--

-->{{#Taxon:
name=Ceratodon
|author=Terry T. McIntosh
|authority=Bridel
|rank=genus
|parent rank=family
|synonyms=
|basionyms=
|family=Ditrichaceae
|distribution=Worldwide.
|reference=burley1990a;snider1994a
|publication title=Bryol. Univ.
|publication year=
|special status=
|source xml=https://jpend@bitbucket.org/aafc-mbb/fna-data-curation.git/src/f6b125a955440c0872999024f038d74684f65921/coarse_grained_fna_xml/V27/V27_640.xml
|genus=Ceratodon
}}<!--

-->[[Category:Treatment]][[Category:Ditrichaceae]]