Chlorophyta orders

Ulvales is an order of green algae in the class Ulvophyceae. Algae of this order are most commonly found in aquatic habitats (mainly marine or brackish waters); some are found in fresh water or are terrestrial. They are found free-floating, attached to a substrate, or endophytic. Well-known examples include Ulva (including Enteromorpha), which is commonly known as sea lettuce and is a ubiquitous seaweed.

Dasycladales is an order of large unicellular green algae in the class Ulvophyceae. It contains two extant families, the Dasycladaceae and the Polyphysaceae.

Cladophorales are an order of green algae, in the class Ulvophyceae. Most members of this order are found in marine habitats; transitions to freshwater have occurred four times, in Pithophoraceae, Cladophora, Rhizoclonium, and Pseudorhizoclonium respectively. Only two genera, Spongiochrysis and Pseudorhizoclonium, are terrestrial.

The Chlorellales are an order of green algae in the class Trebouxiophyceae.

Bryopsidales is an order of green algae, in the class Ulvophyceae. It is a diverse group of mostly marine macroalgae.

Chlamydomonadales, also known as Volvocales, are an order of flagellated or pseudociliated green algae, specifically of the Chlorophyceae. Chlamydomonadales can form planar or spherical colonies. These vary from Gonium (four to 32 cells) up to Volvox (500 cells or more). Each cell has two flagella, and is similar in appearance to Chlamydomonas, with the flagella throughout the colony moving in coordination.

Chlorodendrales are an order of green, flagellated, thecate, unicellular eukaryotes, within the green algae class Chlorodendrophyceae. Prasinophyceae are defined by their cellular scales which are composed of carbohydrates, and Chlorodendrales are unique within this group due to these scales forming a fused thecal wall. Cells of Chlorodendrales are completely covered in scales, which fuse around the cell body producing the theca, but remain individually separated on the flagella, of which there are typically four per cell. Species within Chlorodendrales live in both marine and fresh water habi

REDIRECT Oedogoniaceae

Ulotrichales is an order of green algae in the class Ulvophyceae. Members of this order are most common in freshwater and marine habitats, although some are terrestrial or aerophytic.

Sphaeropleales is an order of green algae that used to be called Chlorococcales. The order includes some of the most common freshwater planktonic algae such as Scenedesmus and Pediastrum. The Sphaeropleales includes vegetatively non-motile unicellular, colonial , or filamentous taxa. They have biflagellate zoospores with flagella that are directly opposed in direction (the DO arrangement): Sphaeroplea, Atractomorpha, Neochloris, Hydrodictyon, and Pediastrum. All of these taxa have basal body core connections. Motile cells generally lack cell walls or have only a very fine layer surrounding the

thumb|Illustration of some Chaetophorales Chaetophorales is an order of green algae in the class Chlorophyceae. Algae in the order Chaetophorales consist of filamentous, branched algae. The thalli have two parts, a prostrate and upright section and the filaments are variously branched. The algae are found in freshwater habitats or terrestrial habitats.

thumb|right|Various algae, formerly classified within Chlorococcales Chlorococcales is a formerly recognized order of green algae in the class Chlorophyceae. , the type family Chlorococcaceae was placed in the order Chlamydomonadales.

REDIRECT Trentepohliaceae

Pyramimonadales are an order of green algae in the Chlorophyta. The chloroplasts of phototrophic euglenids probably came from endosymbiosis with a member of this order.

thumb|right|Scientific illustration|Illustration of [[Tetraspora gelatinosa]] The Tetrasporales are a formerly recognized order of green algae, specifically the Chlorophyceae, now included in Chlamydomonadales. AlgaeBase places Tetraspora and Tetrasporaceae in Chlamydomonadales.

Mamiellales are an order of green algae in the class Mamiellophyceae. Their cells and flagella are covered with spiderweb-like scales of several types. Some species lack scales but possess pigments similar to those of the scale-bearing species.

Prasiolales is an order of green algae in the class Trebouxiophyceae. Members of this order are ecologically widespread and are found in freshwater, marine, and terrestrial habitats from the Arctic to the Antarctic.

The Trebouxiales are an order of green algae in the class Trebouxiophyceae.

Pseudoscourfieldiales is an order of green algae in the class Pseudoscourfieldiophyceae.

Chaetopeltidales are an order of green algae in the class Chlorophyceae. In comparison to other chlorophycean orders, the order is species-poor and was circumscribed relatively recently, in 1994; the key ultrastructural features include having zoospores with four flagella, with the basal bodies in a cruciate arrangement.

REDIRECT Microthamniaceae

Dolichomastigales are an order of green algae in the class Mamiellophyceae.

REDIRECT Oltmannsiellopsidaceae