Option 1 states that members of Chlorophyceae are commonly called green algae. This is correct, as Chlorophyceae is a class of algae that typically have chlorophyll, giving them a green color.

Option 2 states that members of Phaeophyceae are commonly called red algae. This is incorrect. Members of Phaeophyceae, also known as brown algae, are typically brown or olive in color due to the presence of pigments such as fucoxanthin.

Option 3 states that members of Rhodophyceae are commonly called red algae. This is correct. Rhodophyceae is a class of algae that is commonly referred to as red algae because they contain red or reddish pigments.

Option 4 states that members of Phaeophyceae are commonly called brown algae. This is correct. Phaeophyceae, or brown algae, are named so because they have brown pigments in addition to chlorophyll, giving them a brown color.

Therefore, the correct answer is option 2, as members of Phaeophyceae are not commonly called red algae, but rather brown algae.