To solve this problem, we need to understand the storage products and pigments associated with different algae.$\newline$Let's analyze each option:$\newline$• Option 1: Ectocarpus – Fucoxanthin$\newline$ - Ectocarpus is a brown alga, and fucoxanthin is a characteristic pigment of brown algae.$\newline$ - This match is correct.$\newline$• Option 2: Ulothrix – Mannitol$\newline$ - Ulothrix is a green alga. Mannitol is a storage product found in brown algae, not green algae.$\newline$ - This match is incorrect.$\newline$• Option 3: Porphyra – Floridian Starch$\newline$ - Porphyra is a red alga, and Floridian starch is a storage product found in red algae.$\newline$ - This match is correct.$\newline$• Option 4: Volvox – Starch$\newline$ - Volvox is a green alga, and starch is a common storage product in green algae.$\newline$ - This match is correct.$\newline$Therefore, the incorrectly matched option is Option 2: Ulothrix – Mannitol.