| John M. Holzinger |
Bryophytes; Spermatophytes; Mosses |
| Grace E. Howard |
Mycology; Spermatophytes; Bryophytes; Lichens |
| Howard S. Irwin |
Spermatophytes; Legumes; Lichens |
| Edwin James |
Spermatophytes; Major Stephen H. Long Expedition |
| Jomar Gomes Jardim |
Spermatophytes; Rubiaceae |
| George S. Jenman |
Pteridophytes; Spermatophytes; Phanerogams; Bryophytes |
| Marcus E. Jones |
Mycology; Pteridophytes; Spermatophytes |
| Jacquelyn A. Kallunki |
Spermatophytes; Lichens |
| David D. Keck |
Spermatophytes |
| William Ashbrook Kellerman |
Algae; Bryophytes; Mycology; Spermatophytes |
| Ellsworth P. Killip |
Algae; Bryophytes; Pteridophytes; Spermatophytes; Lichens |
| Roberto M. Klein |
Spermatophytes |
| Boris A. Krukoff |
Spermatophytes; Bryophytes |
| Carl E. O. Kuntze |
Algae; Bryophytes; Pre-Linnaean; Spermatophytes |
| William H. Leggett |
Spermatophytes; Bryophytes |
| John B. Leiberg |
Algae; Bryophytes; Mycology; Spermatophytes |
| William A. Leighton |
Mycology; Spermatophytes; Lichens |
| Frère León |
Algae; Bryophytes; Mycology; Pteridophytes; Spermatophytes |
| P. V. LeRoy |
Bryophytes; Spermatophytes |
| Charles L. Lesquereux |
Algae; Bryophytes; Fossils; Spermatophytes; Mosses |
| Jan C. Lindeman |
Spermatophytes |
| Alain H. Liogier |
Spermatophytes; Algae; Lichens |
| Wayne D. Longbottom |
Spermatophytes; Bryophytes; Pteridophytes; Eastern North America |
| James L. Luteyn |
Spermatophytes; Ericaceae; Lichens |
| Paulus J. M. Maas |
Spermatophytes; Neotropical Annonaceae; Costaceae; Zingiberaceae; Bryophytes |