Order Nostocales

Genus Hapalosiphon Nägeli ex Bornet & Flahault

Hapalosiphon fontinalis (C. Agardh) Bornet – coastal; on mosses; sporadic (Давыдов, 2006).

Genus Tolypothrix Kützing ex Bornet & Flahault 1886

Tolypothrix distorta (Fl. Dan.) Kützing – benthic; brooks; common (own data).
Tolypothrix saviczii Kossinskaya - on moist ground rocks, common, Kastyan island; streams, Chernuye Sheli.
Tolypothrix tenuis Kützing – benthic; mouths of creeks; common (own data).

Genus Anabaena Bory de Saint-Vincent ex Bornet & Flahault

Anabaena circinalis Rabenhorst (=Anabaena hassallii (Kützing) Wittrock) – freshwater, Verkhneye (Upper) Lake, Vodoprovodnoye Lake; planktonic (Бизина, 1998). Planktonic; Verkhneye (Upper) Lake, Ershovsky Lakes; common (own data).
Anabaena flosaquae (Lyngbye) Brébisson – planktonic; Kislosladkoye (Sour-Sweet) Lake; common; in brackish areas of the Velikaya Salma; rare (own data).
Anabaena lemmermannii P. Richter – on pine pollen; Kislaya inlet, Rugozerskaya Bay, Velikaya Salma; common (own data).
Anabaena pseudoscillatoria Bory de Saint-Vincent – epiphyte on Zostera; Kislaya inlet; rare (own data: Anabaena oscillarioides Bory).
Anabaena spiroides Klebs – planktonic; Kislosladkoye (Sour-Sweet) Lake, Ershovsky Lakes; rare (own data).

Genus Aphanizomenon A. Morren ex Bornet & Flahault

Aphanizomenon flos-aquae (Linnaeus) Ralfs ex Bornet & Flahault – planktonic, sporadic, brackish-water Kislosladkoye (Sour-Sweet) Lake

Genus Nodularia Mertens ex Bornet & Flahault

Nodularia harveyana (Thwaites) Thuret – fouling; stones at the mouths of creeks; common (own data).
Nodularia spumigena Mertens – coastal; on dead mosses; sporadic (Давыдов, 2006). Planktonic; brackish areas of the Velikaya Salma; rare; fouling; brackish-water, freshwater; common (own data).

Genus Nostoc Vaucher ex Bornet & Flahault

Nostoc punctiforme (Kützing) Hariot – coastal; on mosses; sporadic (Давыдов, 2006).

Genus Calothrix C.Agardh ex É. Bornet & C. Flahault

Calothrix crustacea Thuret ex Bornet & Flahault – fouling; on Fucus serratus in the Velikaya Salma; sporadic; on sublittoral rocks; common (own data).
Calothrix fasciculata C. Agardh – coastal, supralittoral; on rocks, on lichens; sporadic (Давыдов, 2006).
Calothrix gracilis F. E. Fritsch – coastal; on wet rocks; sporadic (Давыдов, 2006).
Calothrix parietina (Nägeli) Thuret f. nodosa Erceg. – coastal, supralittoral, littoral; on dead mosses, on rocks; sporadic (Давыдов, 2006).
Calothrix ramenskii Elenkin – on submerged wood; Vodoprovodnoye Lake; sporadic (own data).
Calothrix scopulorum (Weber & Mohr) C. Agardh – supralittoral; in the crevices of rocks; rare (Возжинская, 1967).
Calothrix vivipara Harvey – on rocks, supralittoral; Biofiltry Bay; sporadic (own data).

Genus Rivularia (Roth) C.Agardh ex Bornet & Flahault

Rivularia atra Roth – epiphyte on Fucus; common (own data).
Rivularia bullata (Poir.) Berkeley – fouling; rocks in the area of the mussel bank near the Bolshoi Eremeevsky Island; sporadic (own data).
Rivularia coadunata (Sommerf.) Foslie – fouling; cliffs, the WSBS settlement; sporadic (own data).

Genus Scytonema C.Agardh ex Bornet & Flahault

Scytonema alatum (Berkeley) Borzi – fouling; walls of the littoral bath; Kastyan island; sporadic (own data).
Scytonema mirabile Bornet – planktonic; Verkhneye (Upper) Lake; rare (own data).

Genus Stigonema C.Agardh ex Bornet & Flahault

Stigonema minutum (C. Agardh) Hassall – coastal, supralittoral; on wet stones, rocks, and mosses; often. (Давыдов, 2006). Benthos; supralittoral baths; Kindo cape, Kastyan island; rare (own data)
Stigonema ocellatum Thuret – fouling; walls of supralittoral baths; common; on mosses; swamps; rare (own data).

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