| John Macoun |
All groups; Algae; Bryophytes; Mycology; Spermatophytes |
| George E. Massee |
Mycology |
| Alfred J. McClatchie |
Algae; Bryophytes; Mycology; Spermatophytes |
| Herbert A. McCullough |
Mycology; Lichens |
| Elmer Drew Merrill |
Algae; Bryophytes; Mycology; Pteridophytes; Spermatophytes; Lichens |
| Orson K. Miller |
Mycology |
| Thomas Morong |
Algae; Spermatophytes; Mycology; Bryophytes |
| Gregory M. Mueller |
Mycology |
| William Alphonso Murrill |
Algae; Cryptogams; Mycology; Spermatophytes; Phanerogams; Lichens |
| Aven Nelson |
Algae; Mycology; Pteridophytes; Spermatophytes |
| Maria Alice Neves |
Mycology |
| Todd W. Osmundson |
Mycology |
| Stuart M. Pady |
Mycology |
| Paul Morrison Patterson |
Bryophytes; Mycology; Musci |
| Cyrus G. Pringle |
Algae; Bryophytes; Mycology; Spermatophytes |
| Eugene Abraham Rau |
Bryophytes; Mycology; Algae; Musci; Pteridophytes; Phanerogams; Cryptogams |
| Clark T. Rogerson |
Mycology; Lichens |
| Per Axel Rydberg |
Algae; Bryophytes; Mycology; Phanerogams; Pteridophytes; Spermatophytes |
| Gary J. Samuels |
Mycology; Bryophytes; Lichens |
| Albert Schneider |
Algae; Lichens; Mycology |
| Carl A. Schwarze |
Mycology |
| Fred J. Seaver |
Mycology; Discomycetes; Lichens |
| Augustine D. Selby |
Algae; Mycology |
| John A. Shafer |
Algae; Pteridophytes; Spermatophytes; Mycology; Bryophytes |
| Aaron J. Sharp |
Algae; Bryophytes; Mycology; Spermatophytes |