| Rhinocladium mexicanum Mercado, Heredia & J. Mena, 1997 |
| Rhinotrichum Corda, 1837 |
| Rhinotrichum mexicanum Guzmán, 1982 |
| Rhodosporidium I. Banno, 1967 |
| Rhodosporidium toruloides I. Banno, 1967 |
| Rhodotorula F. C. Harrison, 1927 |
| Rhodotorula buffonii (C. Ramírez) Roeijmans, Eijk & Yarrow, 1989 |
| Rhodotorula glutinis (Fresen.) F. C. Harrison, 1928 |
| Rhodotorula mucilaginosa (A. Jörg.) F. C. Harrison, 1928 |
| Rogergoosiella A. Hern. Gut. & J. Mena, 1996 |
| Rogergoosiella roystoneicola A. Hern. Gut. & J. Mena, 1996 |
| Roigiella R. F. Castañeda, 1984 |
| Roigiella lignicola R. F. Castañeda, 1984 |
| Sadasivania Subram., 1957 |
| Sadasivania girisa Subram., 1957 |
| Sagartiogeton Carlgren, 1924 |
| Sagartiogeton californicus (Carlgren, 1940) |
| Sarcopodium Ehrenb., 1818 |
| Sarcopodium flavolanatum (Berk. & Broome) L. Lombard & Crous, 2015 |
| Savoryella E. B. G. Jones & R. A. Eaton, 1969 |