These are the brown algae,—some of which may reach 50 m in length (kelps)—the red algae, and the green algae.
ðiːz ɑːɹ ðə bɹˈaʊn ˈælɡiː,—sˌʌm ʌvwˈɪtʃ mˈeɪ ɹˈiːtʃ fˈɪfti ˈɛm ɪn lˈɛŋθ kˈɛlps—ðə ɹˈɛd ˈælɡiː, ænd ðə ɡɹˈiːn ˈælɡiː.