| William C. Sturgis |
Algae; Cryptogams; Mycology; Bryophytes; Spermatophytes |
| David R. Sumstine |
Algae; Mycology; Spermatophytes |
| Benjamin C. Tharp |
Algae; Mycology; Spermatophytes |
| Harry Delbert Thiers |
Mycology |
| John Torrey |
Algae; Bryophytes; Euphorbiaceae; Mycology; Pteridophytes; Spermatophytes |
| Edward Tuckerman |
Mycology; Pteridophytes; Spermatophytes; Lichens; Bryophytes |
| Lucien M. Underwood |
Algae; Bryophytes; Mycology; Pteridophytes; Spermatophytes |
| Arthur L. Welden |
Mycology |
| Percy Wilson |
Algae; Mycology; Spermatophytes; Bryophytes; Lichens |
| Charles Wright |
Lichens; Algae; Bryophytes; Mycology; Pteridophytes; Spermatophytes |
| Sanford M. Zeller |
Algae; Mycology |
| George L. I. Zundel |
Mycology; Uredinales; Ustilaginales |