View source for Pteridium

{{Treatment/ID
|accepted_name=Pteridium
|accepted_authority=Gleditsch ex Scopoli
|publications={{Treatment/Publication
|title=Fl. Carniol.
|place=169. 1760
|year=1760
}}
|basionyms=
|synonyms=
|hierarchy=Dennstaedtiaceae;Pteridium
|hierarchy_nav=<div class="higher-taxa"><div class="higher-taxon"><small>family</small>[[Dennstaedtiaceae]]</div><div class="higher-taxon"><small>genus</small>[[Pteridium]]</div></div>
|etymology=Greek pteridion, a small fern
|volume=Volume 2
|mention_page=
|treatment_page=
}}<!--

--><span class="statement" id="st-d0_s0" data-properties="whole_organism growth form or habitat;whole_organism growth form"><b>Plants </b>terrestrial, often forming colonies or thickets.</span> <span class="statement" id="st-d0_s1" data-properties="stem location;stem size;stem growth form or orientation"><b>Stems </b>subterranean, slender, long-creeping;</span> <span class="statement" id="st-d0_s2" data-properties="hair coloration;hair architecture">hairs pale to dark, jointed;</span> <span class="statement" id="st-d0_s3" data-properties="scale presence">scales absent;</span> <span class="statement" id="st-d0_s4" data-properties="vessel derivation;vessel presence">true vessels present (absent in other Dennstaedtiaceae genera in the flora).</span> <span class="statement" id="st-d0_s5" data-properties="leaf arrangement;leaf shape;leaf some measurement"><b>Leaves </b>widely spaced, broadly deltate, 0.5–4.5 m.</span> <span class="statement" id="st-d0_s6" data-properties="petiole pubescence;vascular-bundle quantity;vascular-bundle shape;vascular-bundle shape"><b>Petiole </b>glabrous to short-hairy, without prickles, with stem buds near base, vascular-bundles numerous, U or O-shaped in cross-section.</span> <span class="statement" id="st-d0_s7" data-properties="blade architecture or shape;rachis architecture;costa architecture"><b>Blade </b>2–4-pinnate, rachis and costae grooved adaxially;</span> <span class="statement" id="st-d0_s8" data-properties="">rachis without prickles;</span> <span class="statement" id="st-d0_s9" data-properties="pinna position;pinna position or shape">nectaries at base of proximal and sometimes distal pinnae.</span> <span class="statement" id="st-d0_s10" data-properties="segment shape;ultimate segment shape;margin architecture or shape"><b>Segments </b>pinnately divided, ultimate segments ovate to oblong to linear, base extending proximally on costae (decurrent) or proximally (surcurrent), margins entire.</span> <span class="statement" id="st-d0_s11" data-properties="vein fusion;vein fusion;vein shape"><b>Veins </b>free or joined at margin by commissural vein beneath sori, pinnately 2–3-forked.</span> <span class="statement" id="st-d0_s12" data-properties="sorus architecture;inner outer false indusium orientation;inner outer false indusium prominence;inner outer false indusium dehiscence or orientation;inner outer false indusium derivation"><b>Sori </b>± continuous, covered by recurved, outer false indusium and obscure, extrorse, inner true indusium.</span> <span class="statement" id="st-d0_s13" data-properties=""><b>Spores </b>tetrahedral-globose, trilete, very finely granulate.</span> <span class="statement" id="st-d0_s14" data-properties="spore shape;spore architecture;spore texture;x chromosome quantity">x = 26.</span><!--

-->{{Treatment/Body
|distribution=Almost worldwide
|discussion=<p>Species 1 (1 species, 4 varieties in the flora).</p>
|tables=
|references={{Treatment/Reference
|id=page1976a
|text=Page, C. N. 1976. The taxonomy and phytogeography of bracken---A review. J. Linn. Soc., Bot. 73: 1--34.
}}{{Treatment/Reference
|id=perring1976a
|text=Perring, F. H. and B. G. Gardener, eds. 1976. The biology of bracken. [Symposium.] J. Linn. Soc., Bot. 73(1--3): i--vi, 1--302.
}}{{Treatment/Reference
|id=tryon1941a
|text=Tryon, R. M. 1941. A revision of the genus Pteridium. Rhodora 43: 1--31, 37--67.
}}
}}<!--

--><!--

-->{{#Taxon:
name=Pteridium
|author=Carol A. Jacobs;James H. Peck
|authority=Gleditsch ex Scopoli
|rank=genus
|parent rank=family
|synonyms=
|basionyms=
|family=Dennstaedtiaceae
|distribution=Almost worldwide
|reference=page1976a;perring1976a;tryon1941a
|publication title=Fl. Carniol.
|publication year=1760
|special status=
|source xml=https://bibilujan@bitbucket.org/aafc-mbb/fna-fine-grained-xml.git/src/84153f6d59a0a91d69695978a64cee7560374f8e/V2/V2_803.xml
|genus=Pteridium
|blade architecture or shape=2-4-pinnate
|costa architecture=grooved
|hair architecture=jointed
|hair coloration=pale;dark
|inner outer false indusium dehiscence or orientation=extrorse
|inner outer false indusium derivation=true
|inner outer false indusium orientation=recurved
|inner outer false indusium prominence=obscure
|leaf arrangement=spaced
|leaf shape=deltate
|leaf some measurement=0.5m;4.5m
|margin architecture or shape=entire
|petiole pubescence=glabrous;short-hairy
|pinna position=proximal
|pinna position or shape=distal
|rachis architecture=grooved
|scale presence=absent
|segment shape=divided
|sorus architecture=continuous
|spore architecture=trilete
|spore shape=tetrahedral-globose
|spore texture=granulate
|stem growth form or orientation=long-creeping
|stem location=subterranean
|stem size=slender
|ultimate segment shape=ovate;oblong
|vascular-bundle quantity=numerous
|vascular-bundle shape=o--shaped;u
|vein fusion=joined;free
|vein shape=2-3-forked
|vessel derivation=true
|vessel presence=absent
|whole_organism growth form=plant
|whole_organism growth form or habitat=terrestrial
|x chromosome quantity=26
}}<!--

-->[[Category:Treatment]][[Category:Dennstaedtiaceae]]