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{{Taxobox
| color = lightgreen
| name = ''Adiantum''
| image = Adiantum pedatum 09905.JPG
| image_width = 240px
| image_caption = Northern Maidenhair (''Adiantum pedatum'')
| regnum = [[Plant]]ae
| divisio = [[Pteridophyta]]
| classis = [[Pteridopsida]]
| ordo = [[Pteridales]]
| familia = [[Pteridaceae]] ([[Adiantaceae]])
| genus = '''''Adiantum'''''
| genus_authority = [[Carolus Linnaeus|L.]]
| subdivision_ranks = Species
| subdivision = See text
}}

'''''Adiantum''''' ('''maidenhair fern''') is a [[genus]] of about 200 species of [[fern]]s in the [[family (biology)|family]] [[Pteridaceae]], though some researchers place it in its own family, Adiantaceae. The genus name comes from the [[Greek language|Greek]], meaning "not wetting", referring to the [[frond]]s' ability to shed water without becoming wet.

They are distinctive in appearance, with dark, often black [[Stipe (botany)|stipes]] and [[rachis]]es, and bright green, often delicately-cut [[leaf]] tissue. The sori are borne submarginally, and are covered by reflexed flaps of leaf tissue which resemble indusia. Dimorphism between sterile and fertile fronds is generally subtle.

They generally prefer [[humus]]-rich, moist, well-drained sites, ranging from bottomland [[soil]]s to vertical rock walls. Many species are especially known for growing on rock walls around [[waterfall]]s and water seepage areas.

The highest species diversity is in the [[Andes]] in [[South America]]. Fairly high diversity also occurs in eastern [[Asia]], with nearly 40 species in [[China]].

Two species are commonly native to the eastern [[United States]], with one of these common to western [[Europe]]. The Five-finger fern (''Adiantum pedatum'') is a distinctively American species, with a highly distinctive frond form and a bifurcating frond that radiates pinnae on one side only (see photo in taxobox). It grows from sub-arctic [[North America]] into the deep south of the U.S. The other American species, which also grows in Europe, is the Venus-hair fern (''Adiantum capillus-veneris''). This fern is strictly a southern species in the U.S., and in Europe is confined to the mild, humid [[Atlantic (ocean)|Atlantic]] fringes, including the west of the [[British Isles]]. A species in the western [[United States]], specifically [[California]], is Caifornia Maiden Hair (''Adiantum jordanii'').

There is a rich ''Adiantum'' flora in New Zealand with 3 endemic species (''A. cunninghamii'', ''A. viridescens'' and ''A. fulvum'')in a total of 10 recorded species. Many of these are common especially in the west and south of the islands.

Many species are grown in the [[Horticulture|horticultural]] trade, including both of the species mentioned, as well as a number of tropical species, including ''A. raddianum'' and ''[[Adiantum peruvianum|A. peruvianum]]''. <br clear = left>

<gallery>
Image:Adiantumraddianum1web.jpg|Delta Maidenhair ''Adiantum raddianum''
Image:Adiantumhispidulum1web.jpg|Rough Maidenhair Fern (''Adiantum hispidulum'')
Image:Adiantum cunninghamii.jpg|''Adiantum cunninghamii'' showing characteristic inrolled leaf margin containing sori
</gallery>
;Species
{|
|- valign=top
|
*''[[Adiantum abscissum]]''
*''[[Adiantum aculeolatum]]''
*''[[Adiantum adiantoides]]''
*''[[Adiantum aethiopicum]]'' – Common Maidenhair, True Maidenhair.
*''[[Adiantum alarconianum]]''
*''[[Adiantum aleuticum]]'' – Aleutian Maidenhair, Western Five-fingered Fern
*''[[Adiantum amazonicum]]''
*''[[Adiantum amblyopteridium]]''
*''[[Adiantum amelianum]]''
*''[[Adiantum anceps]]'' – Double Edge Maidenhair
*''[[Adiantum aneitense]]''
*''[[Adiantum angustatum]]''
*''[[Adiantum annamense]]''
*''[[Adiantum atroviride]]''
*''[[Adiantum bellum]]'' – Bermuda Maidenhair
*''[[Adiantum bessoniae]]''
*''[[Adiantum blumenavense]]''
*''[[Adiantum boliviense]]''
*''[[Adiantum bonatianum]]''
*''[[Adiantum bonii]]''
*''[[Adiantum brasiliense]]'' - Brazilian Maidenhair
*''[[Adiantum breviserratum]]''
*''[[Adiantum calcareum]]''
*''[[Adiantum capillus-junonis]]''
*''[[Adiantum capillus-veneris]]'' – Black Maidenhair, Southern Maidenhair, Venus' Hair
*''[[Adiantum caudatum]]'' – Tailed Maidenhair, Trailing Maidenhair
*''[[Adiantum celebicum]]''
*''[[Adiantum christii]]''
*''[[Adiantum comoroense]]''
*''[[Adiantum concinnum]]'' – Polished Maidenhair, Brittle Maidenhair
*''[[Adiantum coreanum]]''
*''[[Adiantum crespianum]]''
*''[[Adiantum cultratum]]''
*''[[Adiantum cuneatiforme]]''
*''[[Adiantum cuneatum]]''
*''[[Adiantum cunninghamii]]''
*''[[Adiantum cupreum]]''
*''[[Adiantum curvatum]]''
*''[[Adiantum davidii]]''
*''[[Adiantum diaphanum]]'' – Filmy Maidenhair, Small Maidenhair.
*''[[Adiantum dioganum]]''
*''[[Adiantum diphyllum]]''
*''[[Adiantum discretodenticulatum]]''
*''[[Adiantum dissimulatum]]''
*''[[Adiantum edgeworthii]]''
*''[[Adiantum elegantulum]]''
*''[[Adiantum emarginatum]]'' – California Maidenhair
*''[[Adiantum erylliae]]''
*''[[Adiantum erythrochlamys]]''
*''[[Adiantum excisum]]'' - Chilean Maidenhair
*''[[Adiantum fengianum]]''
*''[[Adiantum fimbriatum]]''
*''[[Adiantum flabellulatum]]''
*''[[Adiantum formosum]]'' – Giant Maidenhair, Australian Maidenhair
*''[[Adiantum fossarum]]''
*''[[Adiantum fragile]]'' – Fragile Maidenhair
*''[[Adiantum fructosum]]''
*''[[Adiantum fulvum]]''
*''[[Adiantum gertrudis]]''
*''[[Adiantum gibbosum]]''
*''[[Adiantum gingkoides]]''
*''[[Adiantum glabrum]]''
*''[[Adiantum glaureosum]]''
*''[[Adiantum glaucescens]]''
*''[[Adiantum glaucinum]]''
*''[[Adiantum glaziovii]]''
*''[[Adiantum gomphophyllum]]''
*''[[Adiantum gracile]]''
*''[[Adiantum gravesii]]''
*''[[Adiantum grossum]]''
*''[[Adiantum hispidulum]]'' – Rough Maidenhair, Rosy Maidenhair
*''[[Adiantum hollandiae]]''
*''[[Adiantum hornei]]''
*''[[Adiantum hosei]]''
*''[[Adiantum imbricatum]]''
*''[[Adiantum incertum]]''
*''[[Adiantum incisum]]''
*''[[Adiantum intermedium]]''
*''[[Adiantum jordanii]]'' – California Maidenhair
*''[[Adiantum juxtapositum]]''
*''[[Adiantum kendalii]]''
*''[[Adiantum kingii]]''
*''[[Adiantum klossii]]''
*''[[Adiantum lamrianum]]''
*''[[Adiantum latifolium]]'' – Broadleaf Maidenhair
*''[[Adiantum lenvingei]]''
*''[[Adiantum lianxianense]]''
*''[[Adiantum lindenii]]''
*''[[Adiantum lonrentzii]]''
*''[[Adiantum lucidum]]''
|
*''[[Adiantum lunulatum]]''
*''[[Adiantum macrocladum]]''
*''[[Adiantum macrophyllum]]'' – Largeleaf Maidenhair
*''[[Adiantum madagascariense]]''
*''[[Adiantum malaliense]]''
*''[[Adiantum malesianum]]''
*''[[Adiantum mariesii]]''
*''[[Adiantum mcvaughii]]''
*''[[Adiantum melanoleucum]]'' – Fragrant Maidenhair
*''[[Adiantum mendoncae]]''
*''[[Adiantum menglianense]]''
*''[[Adiantum mettenii]]''
*''[[Adiantum mindanaense]]''
*''[[Adiantum monochlamys]]''
*''[[Adiantum monosorum]]''
*''[[Adiantum multisorum]]''
*''[[Adiantum myriosorum]]''
*''[[Adiantum neoguineense]]''
*''[[Adiantum novae-caledoniae]]''
*''[[Adiantum nudum]]''
*''[[Adiantum oaxacanum]]''
*''[[Adiantum obliquum]]'' – Oblique Maidenhair
*''[[Adiantum ogasawarense]]''
*''[[Adiantum opacum]]''
*''[[Adiantum ornithopodum]]''
*''[[Adiantum ovalescens]]''
*''[[Adiantum palaoense]]''
*''[[Adiantum papillosum]]''
*''[[Adiantum paraense]]''
*''[[Adiantum patens]]''
*''[[Adiantum pearcei]]''
*''[[Adiantum pedatum]]'' – Northern Maidenhair, Five-fingered Fern
*''[[Adiantum pentadactylon]]''
*''[[Adiantum peruvianum]]'' – Silver-dollar Fern, Peruvian Maidenhair
*''[[Adiantum petiolatum]]'' – Stalked Maidenhair
*''[[Adiantum philippense]]''
*''[[Adiantum phyllitidis]]''
*''[[Adiantum platyphyllum]]''
*''[[Adiantum poiretti]]''
*''[[Adiantum polyphyllum]]'' – Giant Maidenhair
*''[[Adiantum pseudotinctum]]''
*''[[Adiantum pulchellum]]''
*''[[Adiantum pulcherrimum]]''
*''[[Adiantum pulverulentum]]'' – Glossy Maidenhair
*''[[Adiantum pumilum]]''
*''[[Adiantum pyramidale]]'' – Pyramid Maidenhair
*''[[Adiantum raddianum]]'' – Delta Maidenhair
*''[[Adiantum rectangulare]]''
*''[[Adiantum reniforme]]''
*''[[Adiantum rhizophorum]]''
*''[[Adiantum robinsonii]]''
*''[[Adiantum roborowskii]]''
*''[[Adiantum rondoni]]''
*''[[Adiantum rubellum]]''
*''[[Adiantum rufopetalum]]''
*''[[Adiantum scabrum]]''
*''[[Adiantum schmalzii]]''
*''[[Adiantum schmidtchenii]]''
*''[[Adiantum schweinfurthii]]''
*''[[Adiantum seemannii]]'' - Seeman's Maidenhair
*''[[Adiantum semiorbiculatum]]''
*''[[Adiantum senae]]''
*''[[Adiantum serratifolium]]''
*''[[Adiantum siamense]]''
*''[[Adiantum silvaticum]]''
*''[[Adiantum soboliferum]]''
*''[[Adiantum sordidum]]''
*''[[Adiantum stenochlamys]]''
*''[[Adiantum stolzii]]''
*''[[Adiantum subcordatum]]'' - Big Maidenhair
*''[[Adiantum tenerum]]'' – Fan Maidenhair, Brittle Maidenhair
*''[[Adiantum tenuissimum]]''
*''[[Adiantum tetragonum]]''
*''[[Adiantum tetraphyllum]]'' – Fourleaf Maidenhair
*''[[Adiantum thalictroides]]''
*''[[Adiantum trapeziforme]]'' – Diamond Maidenhair
*''[[Adiantum tricholepis]]'' – Fuzzy Maidenhair
*''[[Adiantum trilobum]]''
*''[[Adiantum tripteris]]''
*''[[Adiantum venustum]]'' – Evergreen Maidenhair, Himalayan Maidenhair.
*''[[Adiantum villosissimum]]''
*''[[Adiantum villosum]]'' – Woolly Maidenhair
*''[[Adiantum viridescens]]''
*''[[Adiantum viridimontanum]]'' – Green Mountain Maidenhair
*''[[Adiantum vivesii]]'' – Puerto Rico Maidenhair
*''[[Adiantum wattii]]''
*''[[Adiantum wilsonii]]'' – Wilson's Maidenhair
*''[[Adiantum zollingeri]]''
|}

==References==
*[http://www.ars-grin.gov/cgi-bin/npgs/html/genus.pl?209 Germplasm Resources Information Network: ''Adiantum'']
*[http://www.efloras.org/florataxon.aspx?flora_id=1&taxon_id=100603 Flora of North America: ''Adiantum'']
*[http://www.efloras.org/browse.aspx?flora_id=3&start_taxon_id=100603 Flora of China: ''Adiantum'' species list]

[[Category:Pteridophyta]]
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