Order Oscillatoriales

Genus Homoeothrix (Thuret ex Bornet & Flahault) Kirchner

Homoeothrix endophytica Lemmermann – in the slime of Batrachospermum; Verkhneye (Upper) Lake; sporadic (own data).

Genus Lyngbya C. Agardh ex Gomont

Lyngbya confervoides C. A. Agardh ex Gomont – fouling; on coastal rocks; Cape Kindo, Biofiltry Bay, Kastyan island; rare (own data).
Lyngbya majuscula (Dillwyn) Harvey ex Gomont – fouling; on piles of the WSBS pier; common (own data).
Lyngbya semiplena (C. Agardh) J. Agardh ex Gomont – marine, littoral; on silty-sandy soils; sporadic (Блинова, 1962). Supralittoral; on stones, on green algae (Давыдов, 2006).
Lyngbya splendens Tschern. – planktonic; Verkhneye (Upper) Lake; common (own data).

Genus Oscillatoria Vaucher ex Gomont

Oscillatoria bonnemaisonii (P. L. Crouan & H. M. Crouan) P. L. Crouan & H. M. Crouan ex Gomont – fouling; stones in the upper littoral; common; planktonic; Velikaya Salma; rare (own data: Oscillatoria bonnemaisonii (Crouan) Gomont).
Oscillatoria sancta Kützing ex Gomont – planktonic; Ershovsky Lakes; rare; fouling; brackish-water, freshwater; common (own data).

Genus Leibleinia (Gomont) L. Hoffman

Leibleinia willei (Setchell & Gardner) P. C. Silva – epiphyte on Enteromorpha, littoral Malyi Eremeevsky Island; sporadic (own data: Lyngbya nordgaardii Wille).

Genus Microcoleus Desmazières ex Gomont

Microcoleus hospitus Hansgirg - in clusters (tangles) of filamentous brown algae, sporadic, littoral pool, Malyi Eremeevsky Island

Genus Phormidium Kützing ex Gomont

Phormidium chlorinum (Kützing ex Gomont) Umezaki & Watanabe – benthos; supralittoral basins; Cape Kindo, Kastyan island; rare (own data: Oscillatoria chlorina (Kützing) Gomont.).
Phormidium laetevirens (P.L. Crouan & H.M. Crouan ex Gomont) Anagnostidis & Komárek – fouling; stones in the area of the mussel bank near the Bolshoi Eremeevsky Island; sporadic (own data: Oscillatoria laetevirens Crouan).
Phormidium limosum (Dillwyn) P.C. Silva – freshwater, Verkhneye (Upper) Lake, Vodoprovodnoye (Potable water) Lake; planktonic (Бизина, 1998: as Oscillatoria limosa (Dillwyn) C. Agardh). Plankton; brackish-water, freshwater; common (own data: Oscillatoria tenuis C.A.Agardh).

Genus Symplocastrum (Gomont) Kirchner ex Engler & Prantl

Symplocastrum friesii (Gomont ex Gomont) Kirchner – benthic; banks of the creek opposite to the Bolshoi Eremeevsky Island; sporadic (own data: Schizothrix friesii (C.A.Agardh) Gomont).

Genus Schizothrix Kützing ex Gomont

Schizothrix coriacea (Kützing) Gomont – on wood; supralittoral; Biofiltry Bay; sporadic (own data).
Schizothrix heufleri Grunow – on wet stones; Chernuye Sheli; sporadic (own data).

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