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Wastewater ponds

Green algae

[Actinastrum] (sewage pond), X640. Photo: Otago Regional Council & Manaaki Whenua

Actinastrum (Radiococcaceae)

Cells long and thin, with tapering ends
[Ankistrodesmus] (sewage pond), X400. Photo: Manaaki Whenua

Ankistrodesmus (Radiococcaceae)

Cell outline long and thin
[Chlamydomonas], X1000. Photo: Phil Novis, Manaaki Whenua

Chlamydomonas (Chlamydomonadaceae)

Cell with rigid cell wall and motile
Chlorella (sewage pond), X640. Photo: Otago Regional Council & Manaaki Whenua

Chlorella - like unicells (Chlorellaceae)

Cells containing membrane-bound organelles
[Chodatella] (sewage pond), X400. Photo: Otago Regional Council & Manaaki Whenua

Chodatella (Oocystaceae)

Cell wall ornamented with spines
[Closteriopsis] (sewage pond), X640. Photo: Otago Regional Council & Manaaki Whenua

Closteriopsis (Oocystaceae)

Cell outline long and thin
[Coelastrum] (sewage pond), X640. Photo: Manaaki Whenua

Coelastrum (Radiococcaceae)

Colonies have regular structure
[Closterium], Lake Tuakitoto, X640 . Photo: Otago Regional Council & Manaaki Whenua

Closterium (Closteriaceae)

Cell outline crescent-shaped
[Diacanthos] (sewage pond), X640. Photo: Otago Regional Council & Manaaki Whenua

Diacanthos (Oocystaceae)

Cell wall ornamented with spines
[Dictyosphaerium], Lake Rotoiti, X640. Photo: Manaaki Whenua

Dictyosphaerium (Dictyosphaeraceae)

Cells connected by branching threads
[Eudorina], Moke Lake, Otago, X640. Photo: Otago Regional Council & Manaaki Whenua

Eudorina (Volvocaceae)

Cells embedded in a mass of spherical jelly
[Golenkinia] (sewage pond), X640. Photo: Otago Regional Council & Manaaki Whenua

Golenkinia (Micractiniaceae)

Cell wall ornamented with spines
[Micractinium] (sewage pond), X400. Photo: Otago Regional Council & Manaaki Whenua

Micractinium / Errerella (Micractiniaceae)

Colony is a tight mass of cells with long spines radiating outward
[Oocystis] (sewage pond), X1000. Photo: Otago Regional Council & Manaaki Whenua

Oocystis (Oocystaceae)

Cells containing membrane-bound organelles
[Pandorina] (sewage pond), X640. Photo: Otago Regional Council & Manaaki Whenua

Pandorina (Volvocaceae)

Cells embedded in a mass of spherical jelly
[Pediastrum] (sewage pond), X1000. Photo: Otago Regional Council & Manaaki Whenua

Pediastrum (Hydrodictyaceae)

Colonies have regular structure
[Polyedriopsis] (sewage pond), X640. Photo: Otago Regional Council & Manaaki Whenua

Polyedriopsis (Chlorococcaceae)

Cell wall ornamented with spines
[Scenedesmus] (sewage pond), X640. Photo: Manaaki Whenua

Scenedesmus (Radiococcaceae)

Cells ellipsoidal
[Spirogyra], X320. Photo: Otago Regional Council & Manaaki Whenua

Spirogyra (Zygnemataceae)

Cell wall is smooth and featureless
[Tetraedron] (sewage pond), X400. Photo: Otago Regional Council & Manaaki Whenua

Tetraedron (Chlorococcaceae)

Cell wall ornamented with spines
[Westella] (sewage pond), X400. Photo: Manaaki Whenua

Westella-like colonies (Dictyosphaeriaceae)

Cells connected by branching threads