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| THE GREEN ALGAE | |||||
The Green Algae include a large, diverse assemblage of organisms. As presented here, they are all of the "green plants" that do not develop from embryos. As such they represent a grade of complexity rather than a taxonomic unit because they are not monophyletic. Indeed, they straddle both of the subkingdoms in the Viridiplantae. Their disparity in form, ultrastructure, and molecular structure is greater than that of all the other plants and warrants their separation into at least three phyla. The molecular relationships are illustrated well by Marin and Melkonian (1999). The following system is a modification of van den Hoek et al. (1995), and Graham and Wilcox (2000).
Concepts and Terms for the "Green Algae"SUBKINGDOM CHLOROBIONTA (The Chlorobiont Green Algae)
CLASS PRASINOPSIDA
ORDER MAMIELLALES.
Mamiella, Bathycoccus.
ORDER PSEUDOSCOURFELDIALES
Nephroselmis.
ORDER PYRAMIMONADALES
Pyramimonas, Halosphaera, Pachysphaera, Pterosperma, Mesostigma, Dunaliella, Polyblepharides.
ORDER CHLORODENDRALES
Pedinomonas.
ORDER PRASINOCLADALES
Prasinocladus.
CLASS CHLOROLOPSIDA
ORDER SPHAEROPLEALES
Ankistrodesmus, Bracteacoccus, Pediastrum, Hydrodictyon, Scenedesmus, Coelastrum, Tetraedron, Sphaeroplea
ORDER VOLVOCALES
Volvox, Chlamydomonas (some), Dysmorphococcus, Carteria, Chlorogonium, Polytoma, Haematococcus, Phacotus, Pteromonas, Gonium, Pandorina, Platydorina, Pleodorina, Eudorina;: Tetraspora, Gloeococcus, Palmella, Gloeocystis, Hormotila, Paulschulzia, Apiocystis, Chlorococcum (some), Tetracystis, Haematococcus, Chlamydomonas (some), Stephanosphaera, Dunaliella, Chlorococcum (some), Botryococcus, Oocystis, Planktosphaeria, Micractinium, Kirchneriella, Sphaerocystis, Dictyosphaerium, Dimorphococcus, Selenastrum, Protosiphon, Characiosiphon.
ORDER CHLOROSARCINALES
Chlorosarcina, Pseudotetracystis, Borodinellopsis, Borodinella, Axilosphaera, Planophila.
ORDER CHAETOPHORALES
Chaetophora, Uronema, Microspora, Stigeoclonium, Draparnaldia, Draparnaldiopsis, Fritschiella, Microthamnion, Protoderma, Gongrosira, Aphanothece.
ORDER OEDOGONIALES
Oedogonium, Bulbochaete, Oedocladium.
CLASS ULVOPHYCEAE
ORDER ULOTRICHALES
Ulothrix, Urospora, Spongomorpha, Acrosiphonia, Monostroma, Geminella, Stichococcus, Cylindrocapsa.
ORDER ULVALES
Ulva, Enteromorpha, Percursaria, Ulvaria, Trichosarcina, Prasiola.
ORDER TRENTEPOHLIALES = CHROOLEPIDACEAE
Trentepohlia, Cephaleuros.
ORDER SIPHONOCLADALES = CLADOPHORALES
Cladophora, Rhizoclonium, Chaetomorpha, Pithophora, Basicladia, Anadiomene, Siphonocladus, Dictyosphaeria, Valonia, Sphaeroplea.
ORDER CAULERPALES = BRYOPSIALES
Bryopsis, Pseudobryopsis, Derbesia, Caulerpa, Udotea, Codium, Halimeda, Penicillus, Dichotomosiphon.
ORDER ACETABULARIALES = DASYCLADALES: Acetabularia, Batophora, Cymopolia.
CLASS TREBUXIOPHYCEAE = PLEURASTROPHYCEAE
ORDER TREBUXIALES
Myrmecia, Trebouxia, Dictyochloropsis, Chlorella, Nanochlorum, Prototheca, Stichococcus, Golenkinia, Eremosphaera, Microthamnion.
SUBKINGDOM STREPTOBIONTA (The Streptobiont Green Algae)
CLASS MESOSTIGMATOPHYCEAE
ORDER MESOSTIGMATALES
Mesostigma.
ORDER CHAETOSPHAERIDALES
Chaetosphaeridium.
CLASS CHLOROKYBOPHYCEAE
ORDER CHLOROKYBALES
Chlorokybus.
CLASS KLEBSHORMIDIOPHYCEAE
ORDER KLEBSHORMIDIALES)
Klebshormidium.
CLASS ZYGNEMATOPHYCEAE = CONJUGATOPSIDA = GAMOPHYTA
ORDER COSMARIALES (DESMIDIALES)
Cosmarium, Micrasterias, Staurastrum, Hyalotheca, Desmidium, Closterium, Mesotaenium, Spirotaenia, Cylindrocystis, Netrium.
ORDER ZYGNEMATALES
Zygnema, Spirogyra, Mougeotia.
CLASS CHAROPHYCEAE
ORDER CHARALES
Chara, Nitella, Nitellopsis, Tolypella.
CLASS COLEOCHAETOPHYCEAE
ORDER COLEOCHAETALES
Coleochaete.
This page is maintained by Jack R. Holt. Last modified: 03/22/07.