| Author (and author names) | Published between | No. of references | No. of described taxa (valid) |
|---|---|---|---|
| Jordan, K. H. C. | 1968 | 1 | – |
| Jorgensen, C. D. | 1989 | 1 | – |
| Josens, R. | 2011 | 1 | 1 |
| Joseph, G. | 1882 | 1 | – |
| Jouault, C. | 2019–2024 | 5 | 4 |
| Joulie, C. | 1990 | 1 | – |
| Jourdan, H. | 1997–2023 | 7 | – |
| Jørum, P. | 2001 | 1 | – |
| Jucci, C. | 1963 | 1 | – |
| Jules, E. S. | 2005 | 1 | – |
| Julian, G. E. | 1999–2006 | 5 | – |
| Julien, J. F.; Julien, J.-F. | 1998–2004 | 4 | – |
| Jungen, H. | 1976–1983 | 2 | – |
| Jungnickel, H. | 2001–2008 | 3 | – |
| Juniper, B. | 1986 | 1 | – |
| Junqueira, L. K. | 2014 | 1 | – |
| Jurine, L. | 1801–1807 | 2 | 2 |
| Jusino-Atresino, R. | 1992–1994 | 2 | – |
| Just, S. | 1997–1998 | 2 | – |
| Kachonpisitsak, S. | 2022 | 1 | 1 |
| Kaczmarek, W. | 1953 | 1 | – |
| Kadri, A. | 1996 | 1 | – |
| Kadu, S. G. | 2010–2013 | 3 | – |
| Kahle, I. | 1935–1937 | 3 | – |
| Kahono, S. | 2001–2024 | 2 | – |
| Kaib, M. | 1996 | 1 | – |
| Kaisin, M. | 1997 | 1 | – |
| Kaji, T. | 2018 | 1 | – |
| Kalb, R. | 2002 | 1 | – |
| Kallal, R. J. | 2012–2019 | 4 | 20 |
| Kalytta, G. | 2000 | 1 | – |
| Kanao, T. | 2014 | 1 | – |
| Kaneko, G. | 2020 | 1 | – |
| Kaneko, T. | 2001 | 1 | – |
| Kannari, T. | 1980 | 1 | – |
| Kannowski, P. B. | 1954–1997 | 12 | – |
| Kanturski, M. | 2021 | 1 | 1 |
| Kaplin, V. G. | 1989 | 1 | – |
| Kappel, A. W. | 1896 | 1 | – |
| Kapyszewska, E. | 1981 | 1 | – |
| Karaman, C. | 2011–2024 | 25 | 12 |
| Karaman, G. S. | 2003–2005 | 2 | – |
| Karaman, M.; Karaman, M. G. | 2003–2011 | 8 | 2 |
| Karavaiev, V.; Karavajev, V.; Karawaiew, W.; Karawajew, W. | 1906–1937 | 50 | 115 |
| Karl, H. | – | – | – |
| Karl, H.-V. | 2011 | 2 | 1 |
| Karmaly, K. A. | 2004–2012 | 4 | 4 |
| Karpinski, J. J. | 1956 | 1 | – |
| Karube, H. | 2011 | 1 | – |
| Kaschef, A. H. | 1982 | 1 | – |
| Kaspari, M. | 1995–2009 | 12 | – |
| Kasugai, M. | 1983 | 1 | – |
| Katedra Ochrony Lasu i Ekologii | 1984 | 1 | – |
| Kato, K. | 2013 | 1 | – |
| Kato, L. M. | 2003–2010 | 3 | – |
| Kattan, G. H. | 1997 | 1 | – |
| Katzke, J. | 2018–2022 | 5 | 2 |
| Kauffmann, S. | 1993 | 2 | – |
| Kaufmann, B. | 2019–2024 | 2 | 4 |
| Kaufmann, B. E. | 1998–2017 | 2 | 1 |