View source for Archidium ← Archidium You do not have permission to edit this page, for the following reason: The action you have requested is limited to users in the group: Users. You can view and copy the source of this page. {{Treatment/ID |accepted_name=Archidium |accepted_authority=Bridel |publications={{Treatment/Publication |title=Bryol. Univ. |place=1: 747. 1827 , }} |basionyms= |synonyms= |hierarchy=Archidiaceae;Archidium |hierarchy_nav=<div class="higher-taxa"><div class="higher-taxon"><small>family</small>[[Archidiaceae]]</div><div class="higher-taxon"><small>genus</small>[[Archidium]]</div></div> |etymology=Greek arche, primitive form or nature, alluding to small, simple plants and cleistocarpous capsule |volume=Volume 27 |mention_page=page 10, 315, 318, 463 |treatment_page=page 314 }}<!-- --><span class="statement" id="st-d0_s0" data-properties="whole_organism coloration;whole_organism growth form"><b>Plants </b>mostly green.</span> <span class="statement" id="st-d0_s1" data-properties="stem shape;stem some measurement"><b>Stems </b>terete, 1–20 mm.</span> <span class="statement" id="st-d0_s2" data-properties="distal margin orientation;distal margin orientation;distal margin architecture"><b>Leaves </b>of distal portions of stems and of perichaetia ovate, ovatelanceolate, linear-lanceolate to triangular, often reduced and distant in proximal portion of stem, flat or somewhat concave, apex acute to acuminate, sometimes incurved or rarely secund, margins plane, recurved or rarely incurved, distal margins smooth to finely serrulate;</span> <span class="statement" id="st-d0_s3" data-properties="costa fragility;costa presence;costa fragility;costa quantity;costa architecture">costa weak and not reaching apex or sometimes absent, to more often strong, single, percurrent to excurrent in a hairpoint;</span> <span class="statement" id="st-d0_s4" data-properties="laminal areolation variability;laminal areolation variability;cell shape;cell architecture or course;cell shape;cell shape;cell arrangement;cell height or length or size;cell shape;cell arrangement">laminal areolation uniform to somewhat differentiated, cells mostly rectangular to rhomboidal, sometimes irregular in median and distal portions, rectangular and rhomboidal cells mixed with short subquadrate cells, alar cells similar to adjacent cells or differentiated, hyaline, wide-rectangular to quadrate.</span> <span class="statement" id="st-d0_s5" data-properties="cell variability;cell coloration;cell shape;cell reproduction;whole-organism reproduction;whole-organism reproduction;whole-organism reproduction;antheridium architecture;leaf size"><b>Sexual </b>condition autoicous, paroicous or synoicous, antheridia often naked in axils of distal stem-leaves or outer perichaetial leaves, sometimes enclosed in short-shoots with small leaves (bracts).</span> <span class="statement" id="st-d0_s6" data-properties="perichaetial leaf size;perichaetial leaf variability;perichaetial leaf shape;stem-leaf character;stem-leaf character"><b>Perichaetial </b>leaves often larger and more variable in shape than stem-leaves, sometimes broadly ovate to elliptic.</span> <span class="statement" id="st-d0_s7" data-properties="capsule prominence;capsule coloration;capsule coloration"><b>Capsule </b>immersed in perichaetial leaves, brown or golden at maturity.</span> <span class="statement" id="st-d0_s8" data-properties="spore shape;spore coloration;spore coloration;spore coloration;spore relief"><b>Spores </b>spherical to polyhedral, pale-yellow to yellowbrown, golden, orange or red-orange, smooth to finely papillose.</span><!-- -->{{Treatment/Body |distribution=Worldwide except Antarctica;in subtropical to warm-temperate regions |discussion=<p>Species 35 (6 in the flora).</p><!-- --><p>Superficially, species of Archidium can be mistaken for Pleuridium, and many collections of the latter genus have been identified as Archidium. Both genera consist of very small mosses that typically colonize soil in open sites and have ovate-lanceolate to lanceolate leaves, which are often subulate. However, species of Pleuridium have leaves that are often strongly shouldered and long-subulate, a seta, capsules that are typically ovoid (rather than globose) with an apiculate tip, a calyptra, and smaller, more numerous spores. In the descriptions, spore diameters are given for the longest axis (following J. A. Snider 1975).</p> |tables= |references= }}<!-- --><div class="treatment-key"> ==Key== <div class="treatment-key-group"> {| class="wikitable fna-keytable" |-id=key-0-1 |1 |Plants ephemeral, minute, stems mostly smaller than 3 mm, not branched by sterile innovations; leaves oblong to lanceolate, apex acute, costa weak in perichaetial and distal leaves, not reaching apex, sometimes absent; synoicous |[[Archidium minus|Archidium minus]] |-id=key-0-1 |1 |Plants perennial, larger, stems 2-20 mm, commonly branched by sterile innovations; leaves ovate-lanceolate to ovate, apex mostly acuminate; costa strong, percurrent to excurrent; autoicous or paroicous |[[#key-0-2| > 2]] |-id=key-0-2 |2 |Paroicous; antheridia typically naked in axes of perichaetial leaves or distal stem leaves below perichaetium, or sometimes 1-2 small bracts present; sporophytes terminal |[[#key-0-3| > 3]] |-id=key-0-2 |2 |Autoicous; antheridia in leafy axillary buds; sporophytes terminal or lateral |[[#key-0-4| > 4]] |-id=key-0-3 |3 |Perichaetial leaves mostly erect, plane, with serrulate distal margins, median laminal cells narrow (8-13 µm), elongate-rhomboidal, 6-10:1. |[[Archidium alternifolium|Archidium alternifolium]] |-id=key-0-3 |3 |Perichaetial leaves often spreading, plane to recurved, with smooth distal margins, median laminal cells wide (15-35 µm), short-rhomboidal, 3-5:1. |[[Archidium tenerrimum|Archidium tenerrimum]] |-id=key-0-4 |4 |Median laminal cells of distal stem and perichaetial leaves very irregular in shape, from subquadrate to short-rectangular or rhomboidal, intermixed; alar cells not much differentiated from adjacent basal cells |[[Archidium donnellii|Archidium donnellii]] |-id=key-0-4 |4 |Median laminal cells of distal stem and perichaetial leaves with uniform areolation, either rhomboidal or rectangular, alar cells, especially along margin, quadrate to short-rectangular, differentiated from adjacent basal cells |[[#key-0-5| > 5]] |-id=key-0-5 |5 |Median cells of perichaetial leaves wide (15-28 µm), distal leaf margins of distal and perichaetial leaves recurved. |[[Archidium hallii|Archidium hallii]] |-id=key-0-5 |5 |Median cells of perichaetial leaves narrow (9-15 µm), distal leaf margins of distal and perichaetial leaves plane. |[[Archidium ohioense|Archidium ohioense]] |} </div></div><!-- -->{{#Taxon: name=Archidium |authority=Bridel |rank=genus |parent rank=family |synonyms= |basionyms= |family=Archidiaceae |distribution=Worldwide except Antarctica;in subtropical to warm-temperate regions |reference=None |publication title=Bryol. Univ. |publication year= |special status= |source xml=https://bibilujan@bitbucket.org/aafc-mbb/fna-fine-grained-xml.git/src/84153f6d59a0a91d69695978a64cee7560374f8e/V27/V27_430.xml |genus=Archidium |antheridium architecture=naked |capsule coloration=golden;brown |capsule prominence=immersed |cell architecture or course=irregular |cell arrangement=adjacent;mixed |cell coloration=hyaline |cell height or length or size=short |cell reproduction=sexual |cell shape=wide-rectangular;quadrate |cell variability=differentiated |costa architecture=percurrent;excurrent |costa fragility=strong;weak |costa presence=absent |costa quantity=single |distal margin architecture=smooth;finely serrulate |distal margin orientation=incurved;recurved |laminal areolation variability=differentiated;uniform to somewhat |leaf size=small |perichaetial leaf shape=sometimes broadly ovate;elliptic |perichaetial leaf size=larger |perichaetial leaf variability=variable |spore coloration=pale-yellow;yellowbrown golden orange or red-orange |spore relief=smooth;finely papillose |spore shape=spherical;polyhedral |stem shape=terete |stem some measurement=1mm;20mm |stem-leaf character=shape;shape |whole-organism reproduction=synoicous;paroicous;autoicous |whole_organism coloration=green |whole_organism growth form=plant }}<!-- -->[[Category:Treatment]][[Category:Archidiaceae]] Templates used on this page: Template:Archidiaceae (view source) Template:Treatment/AuthorLink (view source) Template:Treatment/Body (view source) Template:Treatment/Body/Maps (view source) Template:Treatment/ID (view source) Template:Treatment/Publication (view source) Return to Archidium.