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''Danaea'' Sm. is a fern genus of approximately 50 species in the eusporangiate fern family Marattiaceae. they are small to intermediately large ferns with erect or creeping rhizomes and usually once pinnate leaves with opposite pinnae. The fertile leaves are contracted, acrostichoid and covered below with sunken, linear synangia. The genus ''Danaea'' has a Neotropical distribution, occurring from southern Mexico through Central America, the Caribbean and northern South America to Bolivia, Paraguay and the Mata Atlantica in Brazil and Northern Argentina. There is also a population on Isla del Coco (Cocos Island) in the Pacific. Two species ''Danaea carillensis'' (Costa Rica) and ''D. simplicifolia'' (Guianas, Brazil, Trinidad) have simple, undivided leaves, and some other species sometimes have bipinnate leaves (''D. bipinnata, D. nodosa, D. urbanii''). One species ''Danaea kalevala'' of the Lesser Antilles was named in honour of the Finnish heroic epic Kalevala. The basal chromosome number for this genus is ''2n=80''. The type species is ''Danaea nodosa''. ==Classification== ''Danaea'' is the basal lineage in the Marattiaceae and the oldest fossils are from the Paleocene, a period where rainforests became more abundant. It has radiated in these early rainforests and presently counts about 50 species in 3 sections: sect. ''Danaea'', sect. ''Arthrodanaea'' and sect. ''Holodanaea''. *''Danaea acuminata'' Tuomisto & R.C.Moran *''Danaea alata'' Sm. *''Danaea antillensis'' Christenh. *''Danaea arbuscula'' Christenh. & Tuomisto *''Danaea bicolor'' Tuomisto & R.C.Moran *''Danaea bipinnata'' Tuomisto *†''Danaea borealis'' Pabst, 1968 *''Danaea carillensis'' H.Christ *''Danaea cartilaginea'' Christenh. & Tuomisto *''Danaea crispa'' Endrés *''Danaea erecta'' Tuomisto & R.C.Moran *''Danaea excurrens'' Rosenst. *''Danaea falcata'' Tuomisto & R.C.Moran *''Danaea geniculata'' Raddi *''Danaea grandifolia'' Underwood *''Danaea humilis'' T.Moore *''Danaea imbricata'' Tuomisto & R.C.Moran *''Danaea jenmanii'' Underw. *''Danaea kalevala'' Christenh. *''Danaea latipinna'' Tuomisto & R.C.Moran *''Danaea leprieurii'' Kunze *''Danaea lingua-cervina'' Christenh. & Tuomisto *''Danaea longicaudata'' Tuomisto *''Danaea mazeana'' Underw. *''Danaea media'' Liebmann *''Danaea moritziana'' C.Presl *''Danaea nodosa'' Sm. *''Danaea oblanceolata'' Stolze *''Danaea plicata'' H.Christ *''Danaea polymorpha'' Lepr. ex Baker *''Danaea riparia'' Christenh. & Tuomisto *''Danaea sellowiana'' C.Presl *''Danaea simplicifolia'' Rudge *''Danaea tenera'' C.V.Morton *''Danaea trichomanoides'' Spruce ex T.Moore *''Danaea trifoliata'' Reichenb. *''Danaea ulei'' H.Christ *''Danaea urbanii'' Maxon *''Danaea ushana'' Christenh. *''Danaea vivax'' Christenh. & Tuomisto *''Danaea wendlandii'' Reichenb.f. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Danaea」の詳細全文を読む スポンサード リンク
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