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Good quality streams

Diatoms

[Achnanthes], Lake Waihola, X640. Photo: Otago Regional Council & Manaaki Whenua

Achnanthes cf inflata (Achnanthaceae)

Chloroplasts visible inside cells are brown
[Cocconeis], Taieri River, X640. Photo: Otago Regional Council & Manaaki Whenua

Cocconeis placentula (Cocconeidaceae)

Central raphe
[Cymbella], X400. Photo: Manaaki Whenua

Cymbella (Cymbellaceae)

Rotational symmetry of cell face outline is 360 degrees; one end is a reflection of the other
[Diatoma], X1000. Photo: Phil Novis, Manaaki Whenua

Diatoma (Fragilariaceae)

Chloroplasts visible inside cells are brown
[Didymosphenia] on mucilaginous stalks, X200. Photo: Manaaki Whenua

Didymosphenia (Gomphonemataceae)

Rotational symmetry of cell face outline is 360 degrees with one end broader than other
[Diploneis], Cluthe River, X1600. Photo: Otago Regional Council & Manaaki Whenua

Diploneis cf elliptica (Diploneidaceae)

Central raphe
[Encyonema], Shotover River, X640. Photo: Otago Regional Council & Manaaki Whenua

Encyonema (Cymbellaceae)

Rotational symmetry of cell face outline is 360 degrees; one end is a reflection of the other
[Epithemia], valve view, X1000. Photo: Otago Regional Council & Manaaki Whenua

Epithemia (Rhopalodiaceae)

Rotational symmetry of cell face outline is 360 degrees; one end is a reflection of the other
[Eunotia sepentina], north Taranaki, X400. Photo: Taranaki Regional Council & Manaaki Whenua

Eunotia and relatives (Eunotiaceae)

Rotational symmetry of cell face outline is 360 degrees; one end is a reflection of the other
[Fragilaria], Waiorau tarn, X640 Photo: Otago Regional Council & Manaaki Whenua

Fragilaria (Fragilariaceae)

Chloroplasts visible inside cells are brown
[Frustulia], Flemming River, X640. Photo: Otago Regional Council & Manaaki Whenua

Frustulia (Amphipleuraceae)

Central raphe
[Gomphoneis] on mucilaginous stalks, X640. Photo: Otago Regional Council & Manaaki Whenua

Gomphoneis (Gomphonemataceae)

Rotational symmetry of cell face outline is 360 degrees with one end broader than other
[Gomphoneis] on mucilaginous stalks, X640. Photo: Otago Regional Council & Manaaki Whenua

Gomphoneis (Gomphonemataceae)

Cells are joined by long stalks made of jelly
[Gyrosigma], Shag River, X400. Photo: Otago Regional Council & Manaaki Whenua

Gyrosigma (Pleurosigmataceae)

Rotational symmetry of cell face outline 180 degrees, with the ends being opposite reflections of each other
[Melosira], X1000. Photo: Otago Regional Council & Manaaki Whenua

Melosira varians (Melosiraceae)

Chloroplasts visible inside cells are brown
[Meridion], Cardrona tributary, X400. Photo: Otago Regional Council & Manaaki Whenua

Meridion cf circulare (Fragilariaceae)

Rotational symmetry of cell face outline is 360 degrees with one end broader than other
[Nitzschia], Kaikorai tributary, X400. Photo: Otago Regional Council & Manaaki Whanua

Nitzschia (Bacillariaceae)

Rotational symmetry of cell face outline 180 degrees, with the ends being opposite reflections of each other
[Pinnularia], Lake Tuakitoto, X640. Photo: Otago Regional Council & Manaaki Whenua

Pinnularia (Pinnulariaceae)

Central raphe
[Rhoicosphenia], X1600. Photo: Otago Regional Council & Manaaki Whenua

Rhoicosphenia cf curvata (Rhoicospheniaceae)

Central raphe
[Rhopalodia], valve view, X640. Photo: Otago Regional Council & Manaaki Whenua

Rhopalodia (Rhopalodiaceae)

Rotational symmetry of cell face outline is 360 degrees; one end is a reflection of the other
[Stauroneis], Horne Creek, X320. Photo: Otago Regional Council & Manaaki Whenua

Stauroneis cf anceps (Stauroneidaceae)

Central raphe
[Surirella], north Taranaki, X400. Photo: Taranaki Regional Council & Manaaki Whenua

Surirella (Surirellaceae)

Raphe on edge of cell
[Tabellaria], upper Taieri River, X640. Photo: Otago Regional Council & Manaaki Whenua

Tabellaria flocculosa (Tabellariaceae)

Chloroplasts visible inside cells are brown
[Ulnaria], X320. Photo: Otago Regional Council & Manaaki Whenua

Ulnaria (Fragilariaceae)

Raphe absent

Green algae

[Bracteacoccus], X1000. Photo: Phil Novis, Manaaki Whenua

Bracteacoccus (Chlorococcaceae)

Cells containing membrane-bound organelles
[Bulbochaete], Kakanui River, north Otago, X7. Photo: Otago Regional Council & Manaaki Whenua

Bulbochaete (Oedogoniaceae)

Branch points roughly equal
[Chaetophora], Kakanui River, X6. Photo: Otago Regional Council & Manaaki Whenua

Chaetophora (Chaetophoraceae)

Filaments are one cell wide
[Characium], Welcome Creek, north Otago, X640. Photo: Otago Regional Council & Manaaki Whenua

Characium (Chlorococcaceae)

Cell outline elongated with basal holdfast
[Draparnaldia], south Taranaki pond, X160. Photo: Taranaki Regional Council & Manaaki Whenua

Draparnaldia (Chaetophoraceae)

Branch are markedly unequal
[Elliptochloris], X1000. Photo: Phil Novis, Manaaki Whenua

Elliptochloris (Prasiolales incertae sedis)

Cells containing membrane-bound organelles
[Interfilum], X1000. Photo: Phil Novis, Manaaki Whenua

Interfilum paradoxum (Klebsormidiaceae)

Cells containing membrane-bound organelles
[Klebsormidium], X1000. Photo: Phil Novis, Manaaki Whenua

Klebsormidium (Klebsormidiaceae)

Cell wall is smooth and featureless
[Microspora], Mill Creek, Otago, X640. Photo: Otago Regional Council & Manaaki Whenua

Microspora (Microsporaceae)

Cell walls composed of overlapping pieces
[Mougeotia], Hayes Creek, X640. Photo: Otago Regional Council & Manaaki Whenua

Mougeotia (Zygnemataceae)

Cell wall is smooth and featureless
[Nitella], X9. Photo: Otago Regional Council & Manaaki Whenua

Nitella (Characeae)

Structured as a main axis with whorls of branches at nodes
[Oedogonium], Shag River, north Otago. Photo: Otago Regional Council & Manaaki Whenua

Oedogonium (Oedogoniaceae)

Chloroplasts visible inside cells are green or yellow-green
[Parallela], Heriot Burn, south Otago, X35. Photo: Otago Regional Council & Manaaki Whenua

Parallela (Palmellaceae)

Colony comprised of cells in flat sheets or skeins; cells lack contrictions
[Schizochlamys], Kakanui River, north Otago, X22. Photo: Otago Regional Council & Manaaki Whenua

Schizochlamys (Tetrasporaceae)

Approx. spherical cells embedded in a mass of jelly
[Sirogonium], X100. Photo: Phil Novis, Manaaki Whenua

Sirogonium (Zygnemataceae)

Cell wall is smooth and featureless
[Spirogyra], X320. Photo: Otago Regional Council & Manaaki Whenua

Spirogyra (Zygnemataceae)

Cell wall is smooth and featureless
[Stigeoclonium], Otago, X4. Photo: Otago Regional Council & Manaaki Whenua

Stigeoclonium (Chaetophoraceae)

Filaments are one cell wide
[Tetraspora], lower Clutha River, X12. Photo: Otago Regional Council & Manaaki Whenua

Tetraspora-like colonies (Tetrasporaceae)

Approx. spherical cells embedded in a mass of jelly
[Ulothrix], X200. Photo: Phil Novis, Manaaki Whenua

Ulothrix zonata (Ulotrichaceae)

Cell wall is smooth and featureless