Some parasitic algae (e.g., the green algae Prototheca and Helicosporidium, parasites of metazoans, or Cephaleuros, parasites of plants) were originally classified as fungi, sporozoans, or protistans of incertae sedis, while others (e.g., the green algae Phyllosiphon and Rhodochytrium, parasites of plants, or the red algae Pterocladiophila and Gelidiocolax mammillatus, parasites of other red algae, or the dinoflagellates Oodinium, parasites of fish) had their relationship with algae conjectured early.
sˌʌm pˌæɹəsˈɪɾɪk ˈælɡiː ˈiː.dʒˈiː., ðə ɡɹˈiːn ˈælɡiː pɹˈoʊɾoʊθˌɛkə ænd hˌɛlɪkˌɑːspoːɹˈɪdiəm, pˈæɹəsˌaɪts ʌv mˌɛɾəzˈoʊənz, ɔːɹ sˌɛfɐlˈɜːɹoʊz, pˈæɹəsˌaɪts ʌv plˈænts wɜːɹ ɚɹˈɪdʒɪnəli klˈæsᵻfˌaɪd æz fˈʌŋɡi, spˌoːɹəzˈoʊənz, ɔːɹ pɹˌɑːɾɪstˈænz ʌv ɪnsˈɜːɾiː sˈɛdiz, wˌaɪl ˈʌðɚz ˈiː.dʒˈiː., ðə ɡɹˈiːn ˈælɡiː fˈɪləsˌɪfən ænd ɹˌoʊdətʃˈaɪtɹiəm, pˈæɹəsˌaɪts ʌv plˈænts, ɔːɹ ðə ɹˈɛd ˈælɡiː tˌɛɹəklˌeɪdɪəfˈɪlə ænd dʒˈɛlɪdɪˌɑːkəlˌæks mˈæmɪlˌæɾəs, pˈæɹəsˌaɪts ʌv ˈʌðɚ ɹˈɛd ˈælɡiː, ɔːɹ ðə dˈɪnəflˌeɪdʒəlˌeɪts uːdˈɪniəm, pˈæɹəsˌaɪts ʌv fˈɪʃ hæd ðɛɹ ɹᵻlˈeɪʃənʃˌɪp wɪð ˈælɡiː kəndʒˈɛktʃɚd ˈɜːli.