青藓科（学名：Brachytheciaceae）为灰藓目的一个科。青藓科是侧蒴藓类中一个大科，其形态特征变化较大，在很大程度上表现出平行演化的特征，而且易受环境的影响。
下级分类
本科包括以下属：[1]
- Achrolepis (S.O.Lindberg) J.Cardot, 1904
- Aerobryum Dozy & Molk.
- Aerolindigia M.Menzel
- Besia Broth.
- Brachytheciastrum Ignatov & Huttunen
- Brachytheciella M.S.Ignatov, 1999
- Brachytheciites J.-P.Frahm, 2005
- 青藓属 Brachythecium Schimp.
- Bryhnia Kaurin
- Bryoandersonia H.Rob.
- Bryostreimannia Ochyra
- Burnettia
- Camptothecium Schimp.
- Catagoniopsis Broth.
- Chamberlainia Grout
- Chionobryum Glowacki, 1913
- Cirrihyllum
- Cirriphyllum Grout
- Cratoneurella H.Rob.
- Cryptoneurum Thériot & P.Varde, 1944
- Eriodon Mont.
- Eurhychiella M.Fleisch.
- Eurhynchiadelphus Ignatov, Huttunen & T.J.Kop.
- Eurhynchiastrum Ignatov & Huttunen
- Eurhynchiella M.Fleischer, 1923
- Eurhynchium B.S.G.
- Eurhynchium Bruch & Schimp.
- 扇青藓属 Flabellidium Herzog
- Frahmiella Ignatov, Vanderp. & Y.F.Wang, 2010
- Hedenaesia S.M.Huttunen & M.S.Ignatov, 2010
- Hedenasiastrum Ignatov & Vanderp.
- Helicodontiadelphus Dixon, 1936
- Homalotheciella (Cardot) Broth.
- Homalothecium Schimp.
- Iishibaea E.Iishiba, 1934
- Isothecium
- Kindbergia Ochyra
- Koponeniella Huttunen & Ignatov, 2015-10
- Kurohimehypnum K.Sakurai, 1950
- Lepyrodontopsis
- Lindigia Hampe
- Mandoniella Herzog
- Meteoridium (Müll.Hal.) Manuel
- Microeurhynchium Ignatov & Vanderp.
- Myuroclada Besch.
- Nobregaea Hedenäs
- Okamuraea Broth.
- Oticodium (Müller Hal.) Kindberg, 1888
- Oxyrrhynchium (Schimp.) Warnst.
- Palamocladium Müll.Hal.
- Panckowia
- Pancovia
- Plasteurhynchium M.Fleisch. ex Broth.
- Platyhypnidium M.Fleisch.
- Pseudopleuropus Takaki, 1955
- Pseudopleuropus Takki
- Pseudorhynchostegiella Ignatov & Vanderp.
- Pseudoscleropodium (Limpr.) M.Fleisch. ex Broth.
- Remyella Müll.Hal.
- Rhynchocarpidium P.Varde & Leroy, 1947
- Rhynchostegiella (Schimp.) Limpr.
- Rhynchostegium Bruch & Schimp.
- Rhynostegium
- Sainthelenia M.S.Ignatov & M.J.Wigginton, 2009
- Schimperella Thér.
- Sciuro-Hypnum Hampe, 1874
- Sciuro-hypnum Hampe
- Scleropodiopsis Ignatov
- Scleropodium Bruch & Schimp.
- Scorpiurium Schimp.
- Squamidium (Müll.Hal.) Broth.
- Steerecleus H.Rob.
- Stenocarpidiopsis M.Fleisch.
- Stenocarpidiopsis M.Fleischer ex V.F.Brotherus, 1925
- Stokesiella (Kindb.) H.Rob.
- Streblopilum
- Streimannia
- Tomentypnum Loeske
- Torrentaria Ochyra
- Trachybryum (Broth.) W.B.Schofield
- Unclejackia M.S.Ignatov, T.J.Koponen & D.H.Norris, 1999
- Zelometeorium Manuel
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