Order Zygnematales

Family Closteriaceae Bessey

Genus Closterium Nitzsch ex Ralfs

• Closterium acerosum (Schrank) Ehrenberg ex Ralfs – planktonic, benthic; lakes; common (own data).
• Closterium aciculare West – benthic, planktonic; Vodoprovodnoye (Potable water) Lake, Verkhneye Ershovskoe lake; sporadic (own data).
• Closterium acutum Brébisson 1848 – freshwater, planktonic, in meromictic lake Trekhtzvetnoe (Ivanova, 2025, pers. communication).
• Closterium ehrenbergii Meneghini – planktonic, benthic; bogs, lakes; rare (own data).
• Closterium kuetzingii Brébisson – planktonic; bogs, lakes; common (own data).
• Closterium leiblenii Kützing – planktonic; bogs, lakes; common (own data).
• Closterium littorale Gay – benthic, planktonic; Verkhneye (Upper) Lake; rare (own data).
• Closterium lunula (O. F.Müller) Nitzsch – planktonic, benthic; bogs, lakes; common (own data).
• Closterium moniliferum (Bory) Ehrenberg – planktonic, benthic; freshwater; common (own data).
• Closterium parvulum Nägeli – benthic, planktonic; bogs, lakes; common (own data).
• Closterium setaceum Ehrenberg ex Ralfs – in marine plankton (Конопля, 1974); sporadically in plankton of meromictic lake Trekhtzvetnoe (Ivanova, 2025, personal communication).
• Closterium tumidulum Gay – benthic; bogs; rare (own data).
• Closterium venus Kützing – benthic, planktonic; bogs, lakes; common (own data); in plankton of meromictic lake Trekhtzvetnoe (Ivanova, 2025, personal communication).

Family Desmidiaceae Ralfs

Genus Actinotaenium (Nägeli) Teiling

• Actinotaenium cucurbita (Brébisson ex Ralfs) Teiling – planktonic; bogs, lakes; common (own data).

Genus Bambusina Kützing

• Bambusina borreri (Ralfs) Cleve – benthic, planktonic; bogs, lakes; common, sometimes dominant (own data: Bambusina brebissonii Kützing).

Genus Cosmarium Corda

• Cosmarium botrytis Meneghini – planktonic; freshwater supralittoral basins, pools, bogs, lakes; common (own data).
• Cosmarium brebissonii Meneghini – benthic; freshwater supralittoral basin; Rugozerskaya Bay; sporadic (own data).
• Cosmarium depressum (Nägeli) Lundell – planktonic; bogs, lakes; common (own data); in plankton of meromictic lake Trekhtzvetnoe (Ivanova, 2025, personal communication).
• Cosmarium granatum Brébisson – planktonic; freshwater supralittoral basins, bogs, lakes; common (own data).
• Cosmarium meneghinii Brébisson – planktonic; supralittoral basins, bogs, lakes; common (own data).
• Cosmarium nasutum Nordstedt – in sphagnums; Verkhneye (Upper) Lake; rare (own data).
• Cosmarium obtusatum (Schmidle) Schmidle – planktonic; supralittoral basins, bogs, lakes; common (own data).
• Cosmarium ochthodes Nordstedt – planktonic; freshwater; everywhere; common (own data).
• Cosmarium praegrande Lundelll – bogs, Verkhneye (Upper) Lake; rare (own data).
• Cosmarium pseudoretusiforme Grönblad – в выжимке из сфагновых мхов, sporadic, the bog near the Eremeevskaya bay.
• Cosmarium punctulatum Brébisson – planktonic; brooks, boggy pools (own data).
• Cosmarium pygmaeum Archer – planktonic; freshwater supralittoral basins, bogs, lakes; common (own data).
• Cosmarium pyramidatum Brébisson – planktonic; freshwater; common (own data).
• Cosmarium reniforme (Ralfs) Archer – planktonic; bogs; common (own data).
• Cosmarium striolatum (Nägeli) Archer – planktonic; Krugloe lake; sporadic (own data).
• Cosmarium subarctoum (Lagerheim) Raciborski – planktonic; Krugloe lake; sporadic (own data).
• Cosmarium turgidum Brébisson – planktonic; bogs; rare (own data).
• Cosmarium ungerianum (Nägeli) de Bary – planktonic; bogs; common (own data).

Genus Cosmocladium Brébisson

• Cosmocladium constrictum (Archer) Joschua – planktonic; Vodoprovodnoye (Potable water) Lake; rare (own data).
• Cosmocladium pulchellum Brébisson – planktonic, benthic; boggy pools; rare (own data).
• Cosmocladium pusillum L. Hilse – planktonic, rare, Vodoprovodnoye (Potable water) Lake.
• Cosmocladium saxonicum de Bary – planktonic; Vodoprovodnoye (Potable water) Lake; sporadic (own data).

Genus Desmidium C. Agardh

• Desmidium asymmetricum Grönblad – benthic; freshwater supralittoral basins; Probkina Gubka inlet; sporadic (own data).
• Desmidium grevillei (Kützing ex Ralfs) De Bary – planktonic, benthic; bogs, lakes; common (own data: Desmidium cylindricum Greville).
• Desmidium swartzii (C. Agardh) C. Agardh – benthic, planktonic; freshwater supralittoral basins, bogs, lakes; common (own data).

Genus Docidium Brébisson ex Ralfs

• Docidium baculum (Brébisson) Brébisson – benthic, planktonic; bogs, lakes; common, sometimes dominant (own data).
• Docidium undulatum Bailey – benthic, planktonic; bogs, lakes; common (own data).

Genus Euastrum Ehrenberg

• Euastrum bidentatum Nägeli – planktonic; bogs, lakes; common (own data); in plankton of meromictic lake Trekhtzvetnoe (Ivanova, 2025, personal communication).
• Euastrum cf. binale' Ehrenberg ex Ralfs 1848 – freshwater, planktonic; in meromictic lake Trekhtzvetnoe (Ivanova, 2025, pers. communication).
• Euastrum divaricatum Lundell – planktonic, benthic; bogs, lakes; common (own data).
• Euastrum elegans (Brébisson in Meneghini) Kützing – planktonic, benthic; bogs, lakes; common (own data).
• Euastrum oblongum (Greville in Hooker) Ralfs – planktonic; bogs, lakes; rare (own data).
• Euastrum pectinatum (Brébisson) Brébisson – planktonic; Verkhneye (Upper) Lake; common; bogs; rare (own data).
• Euastrum verrucosum Ehrenberg – planktonic; bogs, lakes; common (own data).

Genus Haplotaenium T. Bando

• Haplotaenium minutum (Ralfs) Bando – benthic, planktonic; bogs, lakes; rare (own data: Pleurotaenium minutum (Ralfs) Hilse).

Genus Heimansia Coesel

• Heimansia pusilla (L. Hilse) Coesel – planktonic; Vodoprovodnoye (Potable water) Lake; rare (own data: Cosmocladium pusillum Hilse).

Genus Hyalotheca Ehrenberg

• Hyalotheca dissiliens (Smith) Brébisson – planktonic; bogs, lakes; common (own data).
• Hyalotheca mucosa Ralfs – benthic, planktonic; boggy pools, lakes; common (own data Hyalotheca mucosa (Dillwyn) Ehrenberg).

Genus Micrasterias C. Agardh

• Micrasterias crux-melitensis (Ehrenberg) Trevisan – planktonic; bogs, lakes; common (own data).
• Micrasterias papillifera Brébisson – planktonic; bogs, lakes; common (own data).
• Micrasterias rotata (Greville) Ralfs – planktonic; bogs near the WSBS power line swath; sporadic (own data).
• Micrasterias truncata Ralfs – planktonic; bogs, lakes; common (own data: Micrasterias truncata (Corda) Brébisson); in plankton of meromictic lake Trekhtzvetnoe (Ivanova, 2025, personal communication).

Genus Pleurotaenium Nägeli

• Pleurotaenium ehrenbergii (Ralfs) Delponte – bogs, lakes; common (own data).
• Pleurotaenium nodosum (Bailey) Lundell – benthic, planktonic; bogs, lakes; rare (own data).

Genus Sphaerozosma Corda ex Ralfs

• Sphaerozosma aubertianum West – benthic, planktonic; bogs, lakes; common (own data).
• Sphaerozosma commiscuum (Skuja) Palamar-Mordvintzeva [=Sphaerozosma excavatum Ralfs var. commiscuum Skuja] – benthic, sporadic, the bog near the Krugloe lake.
• Sphaerozosma filiforme (Ehrenberg) Bourrelly – planktonic; bogs, Verkhneye (Upper) Lake, Verkhneye Ershovskoe lake; rare (own data).
• Sphaerozosma vertebratum Brébisson ex Ralfs – benthic; a bog near the Verkhneye Ershovskoe lake; sporadic (own data).

Genus Spondylosium Brébisson ex Kützing

• Spondylosium planum (Wolle) W. West & G. S. West – planktonic; freshwater supralittoral basins, bogs, lakes; common (own data).
• Spondylosium pulchellum W. Archer – in sphagnums; the bog near the Verkhneye (Upper) Lake; rare (own data).
• Spondylosium pulchrum (Bailey) W. Archer. – planktonic, benthic; Nizhneye Ershovskoe lake, the bog near it; rare (own data).

Genus Staurastrum (Meyen) Ralfs

• Staurastrum alternans Brébisson 1848 – freshwater., in plankton of meromictic lake Trekhtzvetnoe (Ivanova, 2025, pers. communication).
• Staurastrum crenulatum (Nägeli) Delponte 1877 – freshwater., in plankton of meromictic lake Trekhtzvetnoe (Ivanova, 2025, pers. communication).
• Staurastrum gracile Ralfs ex Ralfs – benthic, planktonic; freshwater supralittoral basins, bogs, lakes; common (own data).
• Staurastrum furcatum Brébisson – supralittoral basins, bogs; rare (own data).
• Staurastrum inflexum Brébisson – freshwater, Verkhneye (Upper) Lake, Vodoprovodnoye (Potable water) Lake; planktonic (Бизина, 1998).
• Staurastrum lanceolatum W. Archer – planktonic; Verkhneye (Upper) Lake, Verkhneye Ershovskoe lake; rare (own data: Staurodesmus lanceolatus (Archer) Croasdale in Teiling).
• Staurastrum pelagicum W. West & G. S. West – planktonic; bogs, lakes; rare (own data).
• Staurastrum platycerum Joshua – freshwater, Verkhneye (Upper) Lake; planktonic (Бизина, 1998); . freshwater, supralittoral basins, bogs, lakes (own data).
• Staurastrum polymorphum Brébisson ex Ralfs – benthic, planktonic; freshwater supralittoral basins, bogs, lakes; common (own data).
• Staurastrum tetracerum Ralfs – planktonic; freshwater supralittoral basins, bogs, lakes; common (own data); in plankton of meromictic lake Trekhtzvetnoe (Ivanova, 2025, personal communication).

Genus Staurodesmus Teiling

• Staurodesmus brevispina (Brébisson ex Ralfs) Croasdale – planktonic, benthic; freshwater supralittoral basins, bogs, lakes; rare (own data).
• Staurodesmus connatus (P. Lundell) Thomasson – benthic; bogs; common (own data).
• Staurodesmus convergens (Ehrenberg ex Ralfs) S. Lilleroth – planktonic; bogs, lakes; common (own data).
• Staurodesmus cuspidatus (Brébisson ex Ralfs) Teiling – planktonic; bogs, lakes; common (own data).
• Staurodesmus dejectus (Brébisson ex Ralfs) Teiling var. apicularis (Brébisson) Teiling – benthic, planktonic; bogs, lakes; rare (own data); in plankton of meromictic lake Trekhtzvetnoe (Ivanova, 2025, personal communication).
• Staurodesmus dickiei (Ralfs) F. Lillieroth – planktonic, benthic; freshwater; rare (own data).
• Staurodesmus incus (Brébisson) Teiling – planktonic; bogs, lakes; common, sometimes dominant (own data).
• Staurodesmus indentatus (W. West & G. S. West) Teiling – planktonic; bogs, lakes; rare (own data).
• Staurodesmus subpygmaeus W. West – planktonic; bogs, lakes; rare (own data).

Genus Teilingia Bourrelly

• Teilingia excavata (Ralfs) Bourrelly – benthic; bogs, Verkhneye (Upper) Lake; rare (own data).
• Teilingia granulata (J. Roy & Bisset) Bourrelly – benthic, planktonic; bogs, lakes; common (own data).
• Teilingia spinulosa (Delp.) Bourrelly [=Sphaerozosma spinulosum Delp.] – planktonic, sporadic, Verkhneye (Upper) Lake, 4.08.2002.
• Teilingia wallichii (J. Jacobsen) Bourelly – planktonic; boggy freshwater supralittoral basin; Kastyan island; sporadic (own data: Teilingia wallichii var. wallichii).

Teilingia wallichii var. anglica (W. West & G. S. West) Kurt Först. – planktonic, benthic; freshwater supralittoral basins, bogs, lakes; rare (own data: Teilingia wallichii var. anglica (W. & G. S.West) Palamar-Mordvintzeva). Genus Tetmemorus Ralfs ex Ralfs

• Tetmemorus brebissonii Ralfs ex Ralfs – benthic; bogs; common (own data).
• Tetmemorus granulatus Brébisson ex Ralfs – benthic, planktonic; bogs, common; common (own data).

Genus Triploceras J. W. Bailey

• Triploceras gracile Bailey – benthic; bogs, lakes; rare (own data).

Genus Xanthidium C. G. Ehrenberg ex Ralfs

• Xanthidium aculeatum Ehrenberg – benthic, planktonic; bogs, lakes; common (own data).
• Xanthidium antilopaeum Kützing – benthic, planktonic; freshwater supralittoral basins, bogs, lakes; common (own data).
• Xanthidium armatum Rabenhorst ex Ralfs – benthic, planktonic; bogs, lakes; rare (own data).
• Xanthidium cristatum Brébisson ex Ralfs – benthic, planktonic; freshwater supralittoral basins, bogs, lakes; common (own data).
• Xanthidium fasciculatum Ehrenberg ex Ralfs – benthic, planktonic; bogs, lakes; common (own data).

Family Mesotaeniaceae Oltmanns

Genus Cylindrocystis Meneghini

• Cylindrocystis brebissonii Meneghini – planktonic; Vodoprovodnoye (Potable water) Lake; common (own data).
• Cylindrocystis crassa de Bary – planktonic; boggy freshwater supralittoral basin; sporadic (own data).

Genus Mesotaenium Nägeli

• Mesotaenium endlicherianum Nägeli – planktonic, benthic; bogs, lakes; common (own data).
• Mesotaenium kramstai Lemmermann – planktonic; Verkhneye (Upper) Lake; rare (own data).
• Mesotaenium macrococcum (Kützing) Roy & Bisset – benthic; Krugloe lake; rare (own data).
• Mesotaenium mirificum Archer – benthic; Krugloe lake; common (own data).

Genus Netrium (Nägeli) Itzigsohn & Rothe

• Netrium digitus (Ehrenberg) Itzigsohn & Rothe – planktonic, benthic; bogs, lakes; common (own data).
• Netrium interruptum (Brébisson) Lütkemüller – planktonic, benthic; bogs, Verkhneye (Upper) Lake; common (own data).
• Netrium oblongum (de Bary) Lütkemüller – bogs, lakes; common (own data).

Genus Roya W. & G. S.West

• Roya obtusa (Brébisson) W. & G. S.West – in sphagnum, bogs, Verkhneye (Upper) Lake, Krugloe lake; common (own data).

Family Peniaceae Haeckel

Genus Genicularia de Bary

• Genicularia spirotaenia de Bary – planktonic; bogs, lakes; common (own data).

Genus Gonatozygon de Bary

• Gonatozygon aculeatum Hastings – planktonic; bogs, lakes; rare (own data).
• Gonatozygon brebissonii de Bary – planktonic; bogs, lakes; common (own data).

Gonatozygon brebissonii var. kjellmanii (Wille) Raciborski – planktonic; bogs; rare (own data: Gonatozygon kjellmani Wille).

• Gonatozygon kinahanii (Archer) Rabenhorst – planktonic; Verkhneye (Upper) Lake, Vodoprovodnoye (Potable water) Lake; rare (own data).
• Gonatozygon monotaenium de Bary – planktonic; bogs, lakes; common (own data); in plankton of meromictic lake Trekhtzvetnoe (Ivanova, 2025, personal communication).

Genus Penium Brébisson

• Penium cylindrus Brébisson ex Ralfs – bogs, Vodoprovodnoye (Potable water) Lake ; common (own data).
• Penium polymorphum Perty – benthic, planktonic; bogs; common (own data).

Family Zygnemataceae Kützing

Genus Mougeotia C. Agardh

• Mougeotia genuflexa (Roth) C.Agardh – freshwater pool; sporadic (own data).

Genus Spirogyra Link

• Spirogyra calospora Cleve – benthic; freshwater pool; WSBS settlement; sporadic (own data).
• Spirogyra crassa (Kützing) Kützing – benthic; freshwater supralittoral basin; Kislaya inlet; sporadic (own data).
• Spirogyra decimina (O. F. Müller) Link – benthic; supralittoral basins, pools; rare (own data).
• Spirogyra grevilleana (Hassall) Kützing – benthic; Verkhneye (Upper) Lake; rare (own data).
• Spirogyra mirabilis (Hassall) Kützing – benthic; bogs, lakes; common (own data).
• Spirogyra tenuissima (Hassall) Kützing – benthic; Vodoprovodnoye (Potable water) Lake; common (own data).
• Spirogyra varians (Kützing) Kützing – benthic; freshwater supralittoral pools; Ermolinskaya Inlet; rare (own data).

Genus Zygnema C. Agardh 1817

• Zygogonium ericetorum Kützing – benthic; bogs; rare (own data: Zygnema ericetorum (Roth) Hansgirg).
• Zygnema pectinatum (Vaucher) C. Agardh – supralittoral basins, bogs, lakes; common (own data).
• Zygnema peliosporum Wittrock – planktonic; Verkhneye (Upper) Lake; rare (own data).

Family Zygnematophyceae incertae sedis

Genus Spirotaenia Brébisson ex Ralfs

• Spirotaenia bryophila (Brébisson) Lütkemüller – in sphagnum; bogs, lakes; rare (own data).
• Spirotaenia condensata Brébisson in Ralfs – planktonic, benthic; rare; in sphagnum; common; bogs, lakes Krugloe lake, Verkhneye (Upper) Lake (own data).
• Spirotaenia truncata Archer – in sphagnum; bogs, lakes; common (own data).

rus: Порядок Zygnematales