1. Lactarius atroviridis Peck
   
2. Lactarius costaricensis Singer
   
3. Lactarius deceptivus Peck
   
4. Lactarius furcatus Coker
   
5. Lactarius gerardii var. subrubescens (A. H. Sm. & Hesler) Hesler & A. H. Sm.
   
6. Lactarius indigo (Schw.) Fr.
   
7. Lactarius psammicola A. H. Sm.
   
8. Lactarius rimosellus Peck
   
9. Lactarius subpalustris Hesler & A. H. Sm.
   
10. Russula alnijorulensis (Singer) Singer [under alder from Costa Rica to Argentina]
    
11. Russula "atromarginata" nom. prov.
    
12. Russula burlinghamiae Singer f. claricolor Buyck
    
13. Russula compacta Frost in Peck
    
14. Russula cartaginis Buyck & Halling
    
15. Russula foetens (Pers.:Fr.) Fr.
    
16. Russula flavida Frost
    
17. Russula fuegiana Singer [extralimital with Nothofagus in Chile and Argentina]
    
18. Russula laurocerasi Melzer
    
19. Russula nigricans (Bull.:Fr.) Fr.
    
20. Russula nothofaginea Singer [extralimital with Nothofagus in Chile and Argentina]
    
21. Russula polyphylla Peck
    
22. Russula quercophila Buyck & Halling
    
23. Russula raoultii Quélet
    
24. Russula vesicatoria Burlingham
    
25. Russula xerampelina Schaeff.:Fr.

A recent synopsis of Russula was authored by L. D. Gómez & R. M. Alfaro. 1996 (1997). Revista Biologica Tropical 44(suppl. 4): 25-37.
Vouchers for all collections are on deposit at the Universidad de Costa Rica (USJ) mycological herbarium.
Duplicates are in the Field Museum (F) and the New York Botanical Garden (NY).