Creator
- Page, Thornton L., 1913-19961
- Pandapas, James J.1
- Pardue, Louis Arthur, 1900-19631
- Parker, Otis Jerome, 1918-19951
- Parker, W. Dale (William Dale), 1925-20071
- Parsons, John T., 1913-20071
- Paterson, J. V., 1867-19471
- Patton, William MacFarland1
- Phillips, William H. (William Hewitt), 1918-20092
- Phycological Society of America1
- Plank, Elizabeth Bartram Temple, 1903-19821
- Pletta, Dan H. (Dan Henry), 1903-19961
- Polhamus, Edward C. (Edward Charles), 1923-20012