Hoek, Mann and Jahns system

A system of taxonomy of algae, the Hoek, Mann and Jahns system was published in

Hoek, C. van den, Mann, D.G. and Jahns, H.M. (1995). Algae An Introduction to Phycology. Cambridge University Press, Cambridge. ISBN 0-521-30419-9.

Division Cyanophyta (= Cyanobacteria)[]

Class Cyanophyceae

Order Chroococcales (e.g., Cyanothece, Aphanothece, Merismopedia, Chroococcus, Gloeocapsa, Microcystis, Chamaesiphon)
Order Pleurocapsales (e.g., , )
Order Oscillatoriales (e.g., Oscillatoria, Lyngbya, )
Order Nostocales (e.g., Nostoc, Anabaena, Aphanizomenon, Scytonema, Rivularia)
Order Stigonematales (e.g., )

Division Prochlorophyta[]

Class (e.g., Prochloron, Prochlorococcus, Prochlorothrix)

Division Glaucophyta[]

Class Glaucophyceae (e.g., Cyanophora, Glaucocystis)

Division Rhodophyta[]

Class Bangiophyceae

Order Porphyridiales (e.g., , Chroodactylon)
Order Rhodochaetales (e.g., )
Order Erythropeltidales (e.g., Erythrotrichia)
Order
Order Bangiales (e.g., Porphyra, Bangia)

Class Florideophyceae

Order Acrochaetiales (e.g., Audouinella)
Order Palmariales (e.g., Palmaria, )
Order Nemaliales (e.g., Nemalion, Galaxaura)
Order Batrachospermales (e.g., Lemanea, )
Order Corallinales (e.g., Lithophyllum, Jania)
Order
Order Bonnemaisoniales
Order Gelidiales (e.g., Gelidium)
Order Gigartinales (e.g., , Dumontia, Chondrus, Mastocarpus)
Order Gracilariales
Order Ahnfeltiales
Order (e.g., Chylocladia)
Order Ceramiales (e.g., Polysiphonia, , Ceramium, Hypoglossum)

Division Heterokontophyta[]

Class Chrysophyceae

Order (e.g., Ochromonas, , Dinobryon)
Order (= Class Synurophyceae, e.g., Mallomonas, Synura)
Order Pedinellales (= Class , e.g., Pedinella)
Order (e.g., , )
Order (e.g., , Hydrurus)
Order Chrysosphaerales (e.g., )
Order Phaeothamniales (e.g., , )

Class

Order Parmales (e.g., )

Class

Order (e.g., , , )

Genus (relative of the Chrysophyceae)
Class Xanthophyceae

Order (e.g., )
Order (e.g., , )
Order (e.g., )
Order (e.g., , , Characiopsis, )
Order (e.g., Tribonema, Heterococcus, )
Order Botrydiales (e.g., Botrydium)
Order (e.g., Vaucheria)

Class Eustigmatophyceae (e.g., , [= ], , , Chlorobotrys, Nannochloropsis)
Class Bacillariophyceae (= Diatomophyceae)

Order Pennales (e.g., Navicula, Gyrosigma, Achnanthes, Tabellaria, Nitzchia, Surirella)
Order Centrales (e.g., Coscinodiscus, Thalassiosira, , , , Odontella, )

Class Raphidophyceae (e.g., , Gonyostomum, , , Fibrocapsa)
Class Dictyochophyceae (e.g., Dictyocha)
Class Phaeophyceae

Order Ectocarpales (e.g., , , Ectocarpus)
Order Sphacelariales (e.g., )
Order Syringodermatales
Order Dictyotales (e.g., Dictyota)
Order Scytosiphonales (e.g., )
Order Cutleriales (e.g., Cutleria)
Order Dictyosiphonales (e.g., Dictyosiphon)
Order Chordariales (e.g., , , Elachista)
Order Sporochnales
Order Desmarestiales (e.g., Desmarestia)
Order Laminariales (e.g., Laminaria, Chorda)
Order Fucales (e.g., Fucus, Hormosira)
Order Durvillaeales (e.g., Durvillaea)
Order Ascoseirales

Class Bicocoecida (e.g., Pseudobodo, Cafeteria)
Class Oomycetes (e.g., Phytophthora)
Class Hyphochytridiomycetes
Class Labyrinthulomycetes

Division Haptophyta (= Prymnesiophyta)[]

Class Haptophyceae

Order (e.g., Chrysochromulina, Prymnesium, , Phaeocystis)
Order Isochrysidales (e.g., Chrysotila, Pleurochrysis [= ])
Order (e.g., Emiliania, Syracosphaera, )
Order Pavlovales (e.g., Pavlova)

Division Cryptophyta[]

Class Cryptophyceae (e.g., Cryptomonas, Chilomonas, Bjornbergiella)

Division Dinophyta[]

Class Dinophyceae

Order Gymnodiniales (e.g., Gymnodinium, Symbiodinium, Polykrikos)
Order (e.g., )
Order (e.g., )
Order (= , e.g., )
Order (e.g., )
Order (e.g., , )
Order Noctilucales (e.g., Noctiluca)
Order Blastodiniales (e.g., Blastodinium)
Order Syndiniales
Order Peridiniales (e.g., Peridinium, , Ceratium, Gonyaulax)
Order (e.g., Dinophysis, , , Ornithocercus, Histioneis)
Order Prorocentrales (e.g., Prorocentrum)

Division Euglenophyta[]

Class Euglenophyceae

Order Euglenales (e.g., Euglena, Astasia)
Order
Order
Order
Order
Order

Division Chlorarachniophyta[]

Class Chlorarachniophyceae (e.g., Chlorarachnion)

Division Chlorophyta[]

Class Prasinophyceae

Order Mamiellales (e.g., Mamiella, Bathycoccus)
Order Pseudoscourfieldiales (e.g., Nephroselmis)
Order Pyramimonadales (e.g., Pyramimonas, Halosphaera, [?], Pterosperma [?], Mesostigma [?])
Genus Pedinomonas (sometimes classified in the class Pedinophyceae, or )
Order Chlorodendrales (e.g., Tetraselmis)

Class Chlorophyceae

Order Volvocales [including the Tetrasporales] (e.g., Chlamydomonas, Chlorogonium, , , , Polytoma, Carteria, Brachiomonas, Lobomonas, , Haematococcus, Phacotus, Pteromonas, Stephanosphaera, Gonium, Pandorina, Eudorina, Volvox, )
Order Chlorococcales (e.g., Chlorococcum, Golenkinia, Chlorella, , Oocystis, Kirchneriella, Nephrocytium, Actinastrum, Crucigenia, Sphaerocystis, Coccomyxa, Scenedesmus, Hydrodictyon, Pediastrum, Chlorosarcinopsis, Cylindrocapsa, Geminella, , Radiofilum, Sphaeroplea, Characiosiphon, Atractomorpha)
Order Chaetophorales (e.g., Uronema, Stigeoclonium, Draparnaldia, Schizomeris)
Order Oedogoniales (e.g., Oedogonium)

Class Ulvophyceae

Order (e.g., , Ulothrix, , Urospora, Acrosiphonia, Monostroma)
Order Ulvales (e.g., Ulva, Enteromorpha, Ulvaria, Acrochaete)

Class

Order Cladophorales (e.g., Cladophora, Chaetomorpha, Rhizoclonium, Struvea, Valonia, Siphonocladus, Dictyosphaeria)

Class Bryopsidophyceae

Order Bryopsidales (e.g., Bryopsis, Pseudobryopsis, Derbesia, Codium)
Order Halimedales (e.g., Udotea, Penicillus, Halimeda, Caulerpa)

Class

Order Dasycladales (e.g., Acetabularia, Batophora, Dasycladus, Neomeris, Cymopolia)

Class

Order Trentepohliales (e.g., Trentepohlia, Cephaleuros)

Class Pleurastrophyceae

Order (e.g., Trebouxia, Myrmecia, Friedmannia, , Pleurastrum, Microthamnion)

Position uncertain:

Order Prasiolales (e.g., Prasiola)

Class Klebsormidiophyceae

Order Klebsormidiales (e.g., Chlorokybus, Raphidonema, Klebsormidium)
Order Coleochaetales (e.g., Chaetosphaeridium, Coleochaete)

Class Zygnematophyceae

Order Zygnematales (e.g., Spirogyra, , Zygnema, Spirotaenia, Cylindrocystis, Netrium)
Order Desmidiales (e.g., Cosmarium, Gonatozygon, Closterium, Pleurotaenium, Tetmemorus, Euastrum, Micrasterias, Cosmocladium, Xanthidium, Staurastrum, Desmidium, Hyalotheca, Spondylosium, Sphaerozosma, Onychonema)

Class Charophyceae

Order Charales (e.g., Chara, , Nitellopsis, Nitella, Tolypella)

Note added in proof[]

In a note added in proof, an alternative classification is presented for the class Chlorophyceae:

Class

Order Volvocales
Order Chaetophorales
Order Chlorococcales (e.g., Chlorococcum, Chlorosarcinopsis, Cylindrocapsa [?])

Class Chlorophyceae

Order Chlorellales (e.g., Chlorella, Kirchneriella, Scenedesmus, Hydrodictyon, Pediastrum, Sphaeroplea, Atractomorpha)

Class

Order Oedogoniales (e.g., Oedogonium)

Many examples of genus given in the book could not be assigned to one of these classes, because the ultrastructural characteristics needed for their classification have not yet been studied.