View source for Adiantum tenerum

{{Treatment/ID
|accepted_name=Adiantum tenerum
|accepted_authority=Swartz
|publications={{Treatment/Publication
|title=Prodr.
|place=135. 1788
|year=1788
}}
|common_names=Brittle maidenhair
|special_status={{Treatment/ID/Special_status
|code=F
|label=Illustrated
}}
|basionyms=
|synonyms=
|hierarchy=Pteridaceae;Adiantum;Adiantum tenerum
|hierarchy_nav=<div class="higher-taxa"><div class="higher-taxon"><small>family</small>[[Pteridaceae]]</div><div class="higher-taxon"><small>genus</small>[[Adiantum]]</div><div class="higher-taxon"><small>species</small>[[Adiantum tenerum]]</div></div>
|volume=Volume 2
|mention_page=
|treatment_page=
}}<!--

--><span class="statement" id="st-d0_s0" data-properties="stem growth form or orientation"><b>Stems </b>short-creeping;</span> <span class="statement" id="st-d0_s1" data-properties="scale coloration;center coloration;margin coloration;margin architecture or pubescence or shape">scales bicolored, centers dark reddish-brown, margins pale tan, erose-ciliate.</span> <span class="statement" id="st-d0_s2" data-properties="leaf orientation;leaf orientation;leaf arrangement;leaf some measurement"><b>Leaves </b>arching or sometimes pendent, closely spaced, 20–110 cm.</span> <span class="statement" id="st-d0_s3" data-properties="petiole diameter;petiole pubescence;petiole pubescence"><b>Petiole </b>1–3 mm diam., glabrous, occasionally glaucous.</span> <span class="statement" id="st-d0_s4" data-properties="blade shape;blade architecture or shape;blade length;blade width;blade size;blade pubescence"><b>Blade </b>trowel-shaped, pinnate, 12–60 × 12–60 cm, gradually reduced distally, glabrous;</span> <span class="statement" id="st-d0_s5" data-properties="proximal pinna architecture or shape">proximal pinnae 3-pinnate;</span> <span class="statement" id="st-d0_s6" data-properties="rachis course;rachis pubescence;rachis pubescence">rachis straight, glabrous, not glaucous.</span> <span class="statement" id="st-d0_s7" data-properties="segment stalk some measurement;segment stalk coloration;base shape;base size"><b>Segment </b>stalks 1–5 mm, with dark color ending abruptly at segment base, terminating in cupulelike swelling at base of segment (unlike any other species of Adiantum in the flora).</span> <span class="statement" id="st-d0_s8" data-properties="ultimate segment shape;ultimate segment shape;ultimate segment width"><b>Ultimate </b>segments fan-shaped or rhombic, about as long as broad;</span> <span class="statement" id="st-d0_s9" data-properties="base shape">base cuneate;</span> <span class="statement" id="st-d0_s10" data-properties="apex shape;apex shape;apex shape;lobe arrangement;incision size or width;incision width">apex rounded or acute, lobed, lobes separated by narrow incisions 0.5 mm wide.</span> <span class="statement" id="st-d0_s11" data-properties="indusium shape;indusium some measurement;indusium pubescence"><b>Indusia </b>transversely oblong to crescent-shaped, 0.5–2 mm, glabrous.</span> <span class="statement" id="st-d0_s12" data-properties="spore diameter;2n chromosome quantity"><b>Spores </b>mostly 40–58 µm diam. <b>2n</b> = 60.</span><!--

-->{{Treatment/Body
|phenology=Sporulating throughout the year.
|habitat=Restricted to moist, shaded, limestone ledges, sink walls, and grottoes in the flora
|elevation=0–50 m
|distribution=Fla.;e;s Mexico;Central America in Guatemala;Honduras;Nicaragua;Costa Rica;South America in Venezuela
|discussion=<p>Adiantum tenerum is readily distinguished from other species in the flora by the ultimate segments conspicuously articulate to the stalks.</p>
|tables=
|references=
}}<!--

--><!--

-->{{#Taxon:
name=Adiantum tenerum
|authority=Swartz
|rank=species
|parent rank=genus
|synonyms=
|basionyms=
|family=Pteridaceae
|phenology=Sporulating throughout the year.
|habitat=Restricted to moist, shaded, limestone ledges, sink walls, and grottoes in the flora
|elevation=0–50 m
|distribution=Fla.;e;s Mexico;Central America in Guatemala;Honduras;Nicaragua;Costa Rica;South America in Venezuela
|reference=None
|publication title=Prodr.
|publication year=1788
|special status=Illustrated
|source xml=https://bibilujan@bitbucket.org/aafc-mbb/fna-fine-grained-xml.git/src/84153f6d59a0a91d69695978a64cee7560374f8e/V2/V2_434.xml
|genus=Adiantum
|species=Adiantum tenerum
|2n chromosome quantity=60
|apex shape=lobed;acute;rounded
|base shape=cuneate;cupulelike
|base size=swelling
|blade architecture or shape=pinnate
|blade length=12cm;60cm
|blade pubescence=glabrous
|blade shape=trowel--shaped
|blade size=reduced
|blade width=12cm;60cm
|center coloration=dark reddish-brown
|incision size or width=narrow
|incision width=0.5
|indusium pubescence=glabrous
|indusium shape=transversely oblong;crescent-shaped
|indusium some measurement=0.5mm;2mm
|leaf arrangement=spaced
|leaf orientation=pendent;arching
|leaf some measurement=20cm;110cm
|lobe arrangement=separated
|margin architecture or pubescence or shape=erose-ciliate
|margin coloration=pale tan
|petiole diameter=1mm;3mm
|petiole pubescence=glaucous;glabrous
|proximal pinna architecture or shape=3-pinnate
|rachis course=straight
|rachis pubescence=not glaucous;glabrous
|scale coloration=bicolored
|segment stalk coloration=dark color
|segment stalk some measurement=1mm;5mm
|spore diameter=40um;58um
|stem growth form or orientation=short-creeping
|ultimate segment shape=rhombic;fan--shaped
|ultimate segment width=broad
}}<!--

-->[[Category:Treatment]][[Category:Adiantum]]