Hymenophyllum é um género de pteridófitas da família Hymenophyllaceae. O seu nome significa folha membranosa, referindo-se ao tecido translúcido muito fino das frondes, o que dá origem ao nome comum deste e de outros fetos de lâmina foliar fina. As lâminas foliares têm geralmente apenas uma célula de espessura e não têm estomas, o que as torna vulneráveis à dessecação. Consequentemente, só se encontram em zonas muito húmidas, como florestas húmidas e entre rochas abrigadas. São pequenas e fáceis de passar despercebidas.J.E. Smith's original description of the genus online at Project Gutenberg. Espécies
A base de dados World Ferns aceitou as seguintes espécies existentes (2022):
Hymenophyllum abruptum Hook. Hymenophyllum acanthoides (Bosch) Rosenst. Hymenophyllum acutum (C.Presl) Ebihara & K.Iwats. Hymenophyllum adiantoides Bosch Hymenophyllum aeruginosum (Poir.) Carmich. Hymenophyllum alveolatum C.Chr. Hymenophyllum amabile Morton Hymenophyllum andinum Bosch Hymenophyllum angulosum Christ Hymenophyllum angustum Bosch Hymenophyllum antillense (Jenman) Jenman Hymenophyllum apiculatum Mett. ex Kuhn Hymenophyllum applanatum (A.M.Gray & R.G.Williams) Ebihara & K.Iwats. Hymenophyllum apteryx M.Kessler & Sundue Hymenophyllum archboldii (Copel.) C.V.Morton Hymenophyllum armstrongii (Baker) Kuhn Hymenophyllum asplenioides (Sw.) Sw. Hymenophyllum assurgens M.Kessler & A.R.Sm. Hymenophyllum australe Willd. Hymenophyllum axillare Sw. Hymenophyllum badium Hook. & Grev. Hymenophyllum baileyanum Domin Hymenophyllum balfourii Baker Hymenophyllum barbatum (Bosch) Baker Hymenophyllum bartlettii (Copel.) C.V.Morton Hymenophyllum batuense Rosenst. Hymenophyllum bicolanum Copel. Hymenophyllum bivalve (G.Forst.) Sw. Hymenophyllum blandum Racib. Hymenophyllum bontocense Copel. Hymenophyllum brachyglossum A.Braun ex Kunze Hymenophyllum brachypus Sodiro Hymenophyllum braithwaitei Ebihara & K.Iwats. Hymenophyllum brassii C.Chr. Hymenophyllum brevifrons Kunze Hymenophyllum brevistipes Liebm. Hymenophyllum bryoides C.W.Chen, Ebihara & K.Y.Cheng Hymenophyllum bryophilum C.Chr. Hymenophyllum caespitosum Gaudich. Hymenophyllum caparaoense Brade Hymenophyllum capense Schrad. Hymenophyllum capillaceum Roxb. Hymenophyllum capillare Desv. Hymenophyllum capurroi de la Sota Hymenophyllum cardunculus C.Chr. Hymenophyllum caudiculatum Mart. Hymenophyllum chamaecyparicola T.C.Hsu & Z.X.Chang Hymenophyllum cocosense A.Rojas Hymenophyllum compactum Bonap. Hymenophyllum consanguineum C.V.Morton Hymenophyllum copelandii C.V.Morton Hymenophyllum cordobense (Hieron.) C.Larsen & Arana Hymenophyllum corrugatum Christ Hymenophyllum crassipetiolatum Stolze Hymenophyllum crispatoalatum Hayata Hymenophyllum crispatum Wall. ex Hook. & Grev. Hymenophyllum crispum Kunth Hymenophyllum cristatum Hook. & Grev. Hymenophyllum cruentum Cav. Hymenophyllum cuneatum Kunze Hymenophyllum cupressiforme Labill. Hymenophyllum darwinii Hook.fil. Hymenophyllum delicatulum Sehnem Hymenophyllum deltoideum C.Chr. Hymenophyllum demissum (G.Forst.) Sw. Hymenophyllum densipilosum A.Rojas Hymenophyllum dentatum Cav. Hymenophyllum denticulatum Sw. Hymenophyllum dependens C.V.Morton Hymenophyllum deplanchei Mett. ex Kuhn Hymenophyllum devolii M.J.Lai Hymenophyllum dicranotrichum (C.Presl) Sadeb. Hymenophyllum digitatum (Sw.) Fosberg Hymenophyllum dilatatum (G.Forst.) Sw. Hymenophyllum dimidiatum Mett. ex Kuhn Hymenophyllum diversilobum (C.Presl) Fée Hymenophyllum eboracense Croxall Hymenophyllum ectocarpon Fée Hymenophyllum edanoi (Copel.) C.V.Morton Hymenophyllum edentulum (Bosch) C.Chr. Hymenophyllum elbertii Rosenst. Hymenophyllum elegans Spreng. Hymenophyllum elongatum J.W.Grimes Hymenophyllum emarginatum Sw. Hymenophyllum exquisitum T.C.Hsu & Y.S.Chao Hymenophyllum exsertum Wall. ex Hook. Hymenophyllum falklandicum Baker Hymenophyllum farallonense Hieron. Hymenophyllum feejeense Brack. Hymenophyllum fendlerianum Sturm Hymenophyllum ferax Bosch Hymenophyllum ferrugineum Colla Hymenophyllum fimbriatum J.Sm. Hymenophyllum firmum Alderw. Hymenophyllum flabellatum Labill. Hymenophyllum flexuosum A.Cunn. Hymenophyllum foersteri Rosenst. Hymenophyllum foxworthyi Copel. Hymenophyllum fragile (Hedw.) Morton Hymenophyllum francii (Christ) Ebihara & K.Iwats. Hymenophyllum frankliniae Colenso Hymenophyllum fuciforme Sw. Hymenophyllum fucoides (Sw.) Sw. Hymenophyllum fujisanense Nakai Hymenophyllum fumarioides Bory ex Willd. Hymenophyllum fuscum (Blume) Bosch Hymenophyllum gardneri Bosch Hymenophyllum geluense Rosenst. Hymenophyllum glaziovii Baker Hymenophyllum gorgoneum Copel. Hymenophyllum gracilescens Domin Hymenophyllum hallieri Rosenst. Hymenophyllum hastatum A.Rojas Hymenophyllum heimii Tardieu Hymenophyllum helicoideum Sodiro Hymenophyllum hemidimorphum R.C.Moran & B.Øllg. Hymenophyllum hemipteron Rosenst. Hymenophyllum herzogii Rosenst. Hymenophyllum hieronymi (Brause) C.Chr. Hymenophyllum hirsutum (L.) Sw. Hymenophyllum hirtellum Sw. Hymenophyllum holochilum (Bosch) C.Chr. Hymenophyllum horizontale C.V.Morton Hymenophyllum hosei Copel. Hymenophyllum humbertii C.Chr. Hymenophyllum humboldtianum E.Fourn. Hymenophyllum hygrometricum (Poir.) Desv. Hymenophyllum imbricatum Blume Hymenophyllum inaequale (Poir.) Desv. Hymenophyllum integrivalvatum C.Sánchez Hymenophyllum interruptum Kunze Hymenophyllum involucratum Copel. Hymenophyllum ivohibense Tardieu Hymenophyllum jamesonii Hook. Hymenophyllum javanicum Spreng. Hymenophyllum jimenezii A.R.Sm. & M.Kessler Hymenophyllum johorense Holttum Hymenophyllum junghuhnii Bosch Hymenophyllum kaieteurum Jenman Hymenophyllum karstenianum J.W.Sturm Hymenophyllum kerianum Watts Hymenophyllum klabatense Christ Hymenophyllum krauseanum Phil. Hymenophyllum kuhnii C.Chr. Hymenophyllum l´herminieri Mett. ex Kuhn Hymenophyllum lamellatum Stolze Hymenophyllum laminatum Copel. Hymenophyllum lanatum Fée Hymenophyllum lanceolatum Hook. & Arn. Hymenophyllum latifrons Bosch Hymenophyllum latisorum M.Kessler & A.R.Sm. Hymenophyllum laxum (Copel.) C.V.Morton Hymenophyllum ledermannii Brause Hymenophyllum lehmannii Hieron. Hymenophyllum leptocarpum Copel. Hymenophyllum leratii Rosenst. Hymenophyllum levingei C.B.Clarke Hymenophyllum lindenii Hook. Hymenophyllum lineare (Sw.) Sw. Hymenophyllum lobatoalatum Klotzsch Hymenophyllum lobbii Moore ex Bosch Hymenophyllum longifolium Alderw. Hymenophyllum longissimum (Ching & P.S.Chiu) K.Iwats. Hymenophyllum lyallii Hook.fil. Hymenophyllum macgillivrayi (Baker) Copel. Hymenophyllum macroglossum Bosch Hymenophyllum macrosorum Alderw. Hymenophyllum macrothecum Fée Hymenophyllum maderense Gibby & Lovis Hymenophyllum malingii (Hook.) Mett. Hymenophyllum marginatum Hook. & Grev. Hymenophyllum matthewsii Bosch Hymenophyllum maxonii Christ ex Morton Hymenophyllum megistocarpum (Copel.) C.V.Morton Hymenophyllum melanosorum (Copel.) C.V.Morton Hymenophyllum microcarpum Desv. Hymenophyllum microchilum (Baker) C.Chr. Hymenophyllum mikawanum (Seriz.) Seriz. Hymenophyllum minimum A.Rich. Hymenophyllum mirificum Morton Hymenophyllum mnioides Baker Hymenophyllum molle C.V.Morton Hymenophyllum mortonianum Lellinger Hymenophyllum mossambicense (Schelpe) Schippers Hymenophyllum multialatum C.V.Morton Hymenophyllum multicristatum A.Rojas Hymenophyllum multifidum (G.Forst.) Sw. Hymenophyllum myriocarpum Hook. Hymenophyllum nahuelhuapiense Diem & J.S.Licht. Hymenophyllum nanostellatum Lellinger Hymenophyllum nanum Sodiro Hymenophyllum neocaledonicum (C.Chr.) Rouhan & C.Del Rio Hymenophyllum nephrophyllum Ebihara & K.Iwats. Hymenophyllum nitiduloides Copel. Hymenophyllum nitidulum (Bosch) Ebihara & K.Iwats. Hymenophyllum novoguineense (Rosenst.) K.Iwats. Hymenophyllum nutantifolium Alderw. Hymenophyllum obtusum Hook. & Arn. Hymenophyllum oligosorum Makino Hymenophyllum ooides F.Muell. & Baker ex Baker Hymenophyllum ovatum Copel. Hymenophyllum pachydermicum Ces. Hymenophyllum pallidum (Blume) Ebihara & K.Iwats. Hymenophyllum palmatifidum (Müll.Berol.) Ebihara & K.Iwats. Hymenophyllum paniculiflorum C.Presl Hymenophyllum paniense Ebihara & K.Iwats. Hymenophyllum pantotactum Alderw. Hymenophyllum parallelocarpum Hayata Hymenophyllum paucicarpum Jenman Hymenophyllum pectinatum Cav. Hymenophyllum peltatum (Poir.) Desv. Hymenophyllum penangianum Matthew & Christ ex Christ Hymenophyllum perparvulum Alderw. Hymenophyllum perrieri Tardieu Hymenophyllum pilosissimum C.Chr. Hymenophyllum pilosum Alderw. Hymenophyllum platylobum Bosch Hymenophyllum plicatum Kaulf. Hymenophyllum plumieri Hook. & Grev. Hymenophyllum plumosum Kaulf. Hymenophyllum pluviatile Perrie & Brownsey Hymenophyllum pollemonianum Rosenst. Hymenophyllum polyanthos (Sw.) Sw. Hymenophyllum poolii Baker Hymenophyllum praetervisum Christ Hymenophyllum prionema Kunze Hymenophyllum proctoris C.Sánchez Hymenophyllum productum Kunze Hymenophyllum protrusum Hook. Hymenophyllum pulchellum Schltdl. & Cham. Hymenophyllum pulcherrimum Colenso Hymenophyllum pumilio Rosenst. Hymenophyllum pumilum C.Moore Hymenophyllum punctisorum Rosenst. Hymenophyllum pyramidatum Desv. Hymenophyllum quetrihuense Diem & J.S.Licht. Hymenophyllum ramosii Copel. Hymenophyllum rarum R.Br. Hymenophyllum recurvum Gaudich. Hymenophyllum reinwardtii Bosch Hymenophyllum revolutum Colenso Hymenophyllum ringens Christ Hymenophyllum riukiuense Christ Hymenophyllum rolandi-principis Rosenst. Hymenophyllum roraimense C.V.Morton Hymenophyllum rubellum Rosenst. Hymenophyllum rufescens Kirk Hymenophyllum rufifolium Alderw. Hymenophyllum rufifrons Alderw. Hymenophyllum rufum Fée Hymenophyllum rugosum C.Chr. & Skottsb. Hymenophyllum ruizianum (Klotzsch) Kunze Hymenophyllum saenzianum L.D.Gómez Hymenophyllum salakense Racib. Hymenophyllum sampaioanum Brade & Rosenst. Hymenophyllum sanguinolentum (G.Forst.) Sw. Hymenophyllum scabrum A.Rich. Hymenophyllum secundum Hook. & Grev. Hymenophyllum semialatum T.C.Hsu Hymenophyllum semiglabrum Rosenst. Hymenophyllum senterreanum Dubuisson & Deblauwe Hymenophyllum seramense K.Iwats., M.Kato & Ebihara Hymenophyllum sericeum (Sw.) Sw. Hymenophyllum serrulatum (C.Presl) C.Chr. Hymenophyllum seselifolium C.Presl Hymenophyllum sibthorpioides (Bory ex Willd.) Mett. ex Kuhn Hymenophyllum sieberi (C.Presl) Bosch Hymenophyllum silvaticum C.V.Morton Hymenophyllum silveirae Christ Hymenophyllum simonsianum Hook. Hymenophyllum simplex C.V.Morton Hymenophyllum sodiroi C.Chr. Hymenophyllum soriemersum Rouhan & C.Del Rio Hymenophyllum splendidum Bosch Hymenophyllum stenocladum (Ching & P.S.Chiu) K.Iwats. Hymenophyllum subdemissum Christ Hymenophyllum subobtusum Rosenst. Hymenophyllum subrigidum Christ Hymenophyllum superbum Morton Hymenophyllum taiwanense (Tagawa) C.V.Morton Hymenophyllum talamancanum A.Rojas Hymenophyllum taliabense Alderw. Hymenophyllum tarapotense Stolze Hymenophyllum tayloriae Farrar & Raine Hymenophyllum tegularis (Desv.) Proctor & Lourteig Hymenophyllum tenerum Bosch Hymenophyllum thuidium Harr. Hymenophyllum todjambuense Kjellb. Hymenophyllum tomaniiviense (Brownlie) Ebihara & K.Iwats. Hymenophyllum tomentosum Kunze Hymenophyllum tortuosum Hook. & Grev. Hymenophyllum trapezoidale Liebm. Hymenophyllum treubii Racib. Hymenophyllum triangulare Baker Hymenophyllum trichomanoides Bosch Hymenophyllum trichophorum (Alderw.) Ebihara & K.Iwats. Hymenophyllum trichophyllum Kunth Hymenophyllum trifoliatum (L.) Proctor & Lourteig Hymenophyllum tunbrigense (L.) Sm. Hymenophyllum turquinense C.Sánchez Hymenophyllum umbratile Diem & J.S.Licht. Hymenophyllum undulatum (Sw.) Sw. Hymenophyllum urbanii Brause Hymenophyllum valvatum Hook. & Grev. Hymenophyllum verecundum Morton Hymenophyllum veronicoides C.Chr. Hymenophyllum vestitum (C.Presl) Bosch Hymenophyllum viguieri Tardieu Hymenophyllum villosum Colenso Hymenophyllum vittatum Copel. Hymenophyllum walleri Maiden & Betche Hymenophyllum whitei Goy Hymenophyllum wilsonii Hook. Hymenophyllum wrightii Bosch
As espécies extintas incluem: †Hymenophyllum axsmithii (Ypresiano, Eocene Okanagan Highlands da América do Norte).