One definition of algae is that they "have chlorophyll as their primary photosynthetic pigment and lack a sterile covering of cells around their reproductive cells".
wˈʌn dˌɛfɪnˈɪʃən ʌv ˈælɡiː ɪz ðˈæt ðeɪ "hæv klˌoːɹoʊfˈɪl æz ðɛɹ pɹˈaɪmɚɹi fˌoʊɾoʊsɪnθˈɛɾɪk pˈɪɡmənt ænd lˈæk ɐ stˈɛɹəl kˈʌvɚɹɪŋ ʌv sˈɛlz ɚɹˈaʊnd ðɛɹ ɹᵻpɹədˈʌktɪv sˈɛlz".