Throughout the 20th century, most classifications treated the following groups as divisions or classes of algae: cyanophytes, rhodophytes, chrysophytes, xanthophytes, bacillariophytes, phaeophytes, pyrrhophytes (cryptophytes and dinophytes), euglenophytes, and chlorophytes.
θɹuːˈaʊt ðə twˈɛntiəθ sˈɛntʃɚɹi, mˈoʊst klˌæsɪfɪkˈeɪʃənz tɹˈiːɾᵻd ðə fˈɑːloʊɪŋ ɡɹˈuːps æz dᵻvˈɪʒənz ɔːɹ klˈæsᵻz ʌv ˈælɡiː: sˈaɪɐnəfˌaɪts, ɹˈoʊdəfˌaɪts, kɹˈɪsəfˌaɪts, zˈænθəfˌaɪts, bˈæsɪlˌɑːɹɹɪəfˌaɪts, fˈiːəfˌaɪts, pˈɪrhəfˌaɪts kɹˈɪptəfˌaɪts ænd dˈɪnəfˌaɪts, jˈuːɡəlnəfˌaɪts, ænd klˌoːɹoʊfˈaɪts.