Cosmarium attenuatum Bréb. in Ralfs = Actinotaenium curtum (Bréb.) Teiling ex Ruzicka & Pouzar var. attenuatum (Bréb.) Teiling ex Ruzicka & Pouzar

Cosmarium basilicum G.S.West

Cosmarium bicuneatum

Cosmarium binerve Lundell

Cosmarium binum Nordst.

Cosmarium bioculatum Bréb. in Ralfs

Cosmarium bipapillatum W. & G.S.West

Cosmarium bipunctatum Borgesen

Cosmarium bireme Nordst.

Cosmarium biretum (Bréb.) Ralfs

Cosmarium bitriangulum Grönblad

Cosmarium blyttii Wille

Cosmarium boeckii Wille

Cosmarium botrytis (Menegh.) Ralfs

Cosmarium brebissonii (Menegh.) Ralfs

Cosmarium broomei (Thwaites) Ralfs

Cosmarium caelatum Ralfs

Cosmarium calcareum Wittr.

Cosmarium canaliculatum W. & G.S.West

Cosmarium candianum Delponte

Cosmarium capitulum R.Roy & Bisset

Cosmarium circulare Reinsch = Cosmarium candianum Delponte

Cosmarium clepsydra Nordst.

Cosmarium coarctatum W.West

Cosmarium commissurale (Bréb.) Ralfs

Cosmarium connatum (Bréb.) Ralfs

Cosmarium conspersum Ralfs

Cosmarium contractum Kirchn.

Cosmarium controversum W.West

Cosmarium corbula Bréb.

Cosmarium coronatum Cooke & A.W.Wills in Cooke

Cosmarium corribense W. & G.S.West

Cosmarium corriense Bisset

Cosmarium costatum Nordst.

Cosmarium crenatum Ralfs

Cosmarium cristatum Ralfs

Cosmarium cucumis Corda ex Ralfs

Cosmarium cucurbita Bréb. ex Ralfs = Actinotaenium cucurbita (Bréb.) Teiling

Cosmarium cyclicum Lundell

Cosmarium cylindricum Ralfs

Cosmarium cymatonotophorum West

Cosmarium cymatopleurum Nordst.

Cosmarium debaryi W.Archer in A.Pritch.

Cosmarium decedens (Reinsch) Racib.

Cosmarium denotarisii (Wittr.) Nordst.

Cosmarium dentiferum Corda ex Nordst.

Cosmarium depressum (Nägeli) Lundell

Cosmarium didymochondrum Nordst.

Cosmarium didymoprotupsum W. & G.S.West

Cosmarium difficile Lütkem.

Cosmarium distichum Nordst.

Cosmarium dovrense Nordst. in Wittr. & Nordst.

Cosmarium eductum R.Roy & Bisset

Cosmarium elegantissimum Lundell

Cosmarium entochondrum W. & G.S.West

Cosmarium etchachanense R.Roy & Bisset

Cosmarium excavatum Nordst.

Cosmarium exiguum W.Archer

Cosmarium fastidiosum W. & G.S.West

Cosmarium flavum R.Roy & Bisset

Cosmarium fontigenum Nordst. in Wittr. & Nordst.

Cosmarium formosulum W.E.Hoffm in Nordst.

Cosmarium formulosum W.E.Hoffm in Nordst.

Cosmarium furcatospermum W. & G.S.West

Cosmarium galeritum Nordst.

Cosmarium garrolense R.Roy & Bisset

Cosmarium gayanum De Toni

Cosmarium geminatum Lundell

Cosmarium geometricum W. & G.S.West

Cosmarium globosum Bulnh.

Cosmarium goniodes W. & G.S.West

Cosmarium granatum Bréb. ex Ralfs

Cosmarium grantii R.Roy & Bisset

Cosmarium granulatum West

Cosmarium hammeri Reinsch

Cosmarium helcangulare Nordst.

Cosmarium hexalobum Nordst.

Cosmarium hibernicum W.West = Actinotaenium hibernicum (W.West) Ruzicka

Cosmarium holmiense Lundell

Cosmarium humile (Gay) Nordst. in De Toni

Cosmarium impressulum Elfving

Cosmarium inaequipellicum West & G.S. West

Cosmarium inconspicuum W. & G.S.West

Cosmarium intermedium Delponte

Cosmarium isthmium West

Cosmarium isthmochondrum Nordst.

Cosmarium jenisejense Boldt

Cosmarium kjellmani Wille

Cosmarium kotilainense Grönblad

Cosmarium laeve Rabenh.

Cosmarium lagenarioides (R.Roy) Lütkem. in W. & G.S.West & N.Carter = Actinotaenium lagenarioides (R.Roy) Teiling

Cosmarium latifrons Lundell

Cosmarium lepidum West

Cosmarium logiense Bisset

Cosmarium lundellii Delponte

Cosmarium luxuriosum (Kouwets) Coesel

Cosmarium margaritatum (P.Lundell) R.Roy & Bisset

Cosmarium margaritiferum (Turpin) Ralfs

Cosmarium melanosporum W.Archer

Cosmarium meneghinii Bréb. in Ralfs

Cosmarium microsphinctum Nordst.

Cosmarium minimum W. & G.S.West

Cosmarium moniliforme (Turpin) Ralfs

Cosmarium monochondrum Nordst.

Cosmarium monomazum Lundell

Cosmarium morsum West

Cosmarium nagelianum Bréb.

Cosmarium nasutum Nordst.

Cosmarium nitidulum De Not.

Cosmarium norimbergense Reinsch

Cosmarium notabile Bréb.

Cosmarium novae-semliae Wille

Cosmarium nymannianum Grunov in Rabenh.

Cosmarium obgoletum (Hantzsch) Reinsch

Cosmarium obliquum Nordst.

Cosmarium oblongum Bennett

Cosmarium obsoletum (Hantzsch) Reinsch

Cosmarium obtusatum Schmidle

Cosmarium ocellatum B.Eichler & Gutw.

Cosmarium ochthodes Nordst.

Cosmarium oligogongrus Reinsch

Cosmarium orbiculatum Ralfs

Cosmarium ornatum Ralfs

Cosmarium orthogonum Delponte

Cosmarium orthostichum Lundell

Cosmarium ovale Ralfs

Cosmarium pachydermum Lundell

Cosmarium palangula Bréb.

Cosmarium parvulum Bréb. = Actinotaenium obcuneatum (W.West) Teiling

Cosmarium perforatum Lundell

Cosmarium pericymatium Nordst.

Cosmarium perpusillum West

Cosmarium phaseolus Bréb. in Ralfs

Cosmarium plicatum Reinsch

Cosmarium pokornyanum (Grunov) W. & G.S.West

Cosmarium polygonum (Nägeli) W.Archer in A.Pritch.

Cosmarium portianum W.Archer

Cosmarium praegrande Lundell

Cosmarium praemorsum Bréb.

Cosmarium prominulum Racib.

Cosmarium promontorium W. & G.S.West

Cosmarium protractum (Nägeli) de Bary

Cosmarium protuberans Lundell

Cosmarium pseudamoenum Wille

Cosmarium pseudarctoum Nordst.

Cosmarium pseudatlantoideum West

Cosmarium pseudobiremum Boldt

Cosmarium pseudobroomei Wolle

Cosmarium pseudoconnatum Nordst.

Cosmarium pseudoexiguum Racib.

Cosmarium pseudonitidulum Nordst.

Cosmarium pseudoprotuberans Kirchn.

Cosmarium pseudopyramidatum Lundell

Cosmarium pulcherrimum Nordst.

Cosmarium punctulatum Bréb.

Cosmarium pusillum (Bréb.) W.Archer in A.Pritch.

Cosmarium pycnochondrum Nordst.

Cosmarium pygmaeum W.Archer

Cosmarium pyramidatum Bréb. in Ralfs

Cosmarium quadratulum (Gay) De Toni

Cosmarium quadratum Ralfs

Cosmarium quadridentatum W. & G.S.West

Cosmarium quadrifarium Lundell

Cosmarium quadrimamillatum W. & G.S.West

Cosmarium quadrum Lundell

Cosmarium quasillus Lundell

Cosmarium quaternarium Nordst. in Wittr. & Nordst.

Cosmarium quinarium Lundell

Cosmarium radiosum Wolle

Cosmarium ralfsii Bréb. in Ralfs

Cosmarium rectangulare Grunov in Rabenh.

Cosmarium rectangulum Reinsch

Cosmarium regnellii Wille

Cosmarium regnesi Reinsch

Cosmarium reinschii W.Archer

Cosmarium reniforme (Ralfs) W.Archer

Cosmarium repandum Nordst.

Cosmarium retusiforme (Wille) Gutw.

Cosmarium retusum (Perty) Rabenh.

Cosmarium scoticum W. & G.S.West

Cosmarium sexangulare Lundell

Cosmarium sexnotatum Gutw.

Cosmarium simii R.Roy & Bisset

Cosmarium sinostegos Schaarschm.

Cosmarium slewdrumense R.Roy

Cosmarium smolandicum Lundell

Cosmarium solidum Nordst.

Cosmarium speciosissimum Schmidle

Cosmarium speciosum Lundell

Cosmarium sphaeroideum W.West

Cosmarium sphagnicolum W. & G.S.West

Cosmarium sphalerostichum Nordst.

Cosmarium sportella Bréb.

Cosmarium subalatum W. & G.S.West

Cosmarium subarctoum (Lagerh.) Racib.

Cosmarium subaversum Borgesen

Cosmarium subbroomei Schmidle

Cosmarium subcapitulum W.West

Cosmarium subcontractum W. & G.S.West

Cosmarium subcostatum Nordst.

Cosmarium subcrenatum Hantzsch

Cosmarium subcucumis Schmidle

Cosmarium subcylindricum W.West

Cosmarium subdanicum W.West

Cosmarium subexcavatum W. & G.S.West

Cosmarium subgranatum (Nordst.) Lütkem.

Cosmarium subimpressulum Borge

Cosmarium subnotabile Wille

Cosmarium subpalangula Elfving = Actinotaenium subpalangula (Elfving) Teiling

Cosmarium subprotumidum Nordst.

Cosmarium subquadrans W. & G.S.West

Cosmarium subquadratum Nordst.

Cosmarium subraciborskii Taft

Cosmarium subreniforme Nordst.

Cosmarium subretusiforme W. & G.S.West

Cosmarium subspeciosum Nordst.

Cosmarium subtrinodulum W. & G.S.West

Cosmarium subtumidum Nordst. in Wittr. & Nordst.

Cosmarium subturgidum (W.B.Turner) Schmidle

Cosmarium subundulatum Wille

Cosmarium succissum W.West

Cosmarium synthlibomenum W.West

Cosmarium tatricum Racib.

Cosmarium taxichondriforme B.Eichler & Gutw.

Cosmarium taxichondrum Lundell

Cosmarium tenue W.Archer

Cosmarium tetrachondrum Lundell

Cosmarium tetragonum (Nägeli) W.Archer in A.Pritch.

Cosmarium tetraophthalmum (Kütz.) Bréb.

Cosmarium thwaitesii Ralfs

Cosmarium tinctum Ralfs

Cosmarium trachydermum W. & G.S.West

Cosmarium trachypleurum Lundell

Cosmarium trafalgaricum Wittr. in Wittr. & Nordst.

Cosmarium trilobulatum Reinsch

Cosmarium truncatellum Perty

Cosmarium tuberculatum W.Archer

Cosmarium tumens Nordst.

Cosmarium tumidum Lundell

Cosmarium turgidum Bréb. ex Ralfs

Cosmarium turneri R.Roy

Cosmarium turpinii Bréb.

Cosmarium umbilicatum Lütkem.

Cosmarium undulatum Corda ex Ralfs

Cosmarium ungerianum (Nägeli) de Bary

Cosmarium variolatum Lundell

Cosmarium venustum (Bréb.) W.Archer in A.Pritch.

Cosmarium vexatum W.West

Cosmarium viride (Corda) ex Joshua = Actinotaenium colpopelta (Bréb.) Compère

Cosmarium vogesiacum A.Lem.

Cosmarium wittrockii Lundell

Cosmarium zonatum Lundell