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).

1. Alpova diplophloeus (Zeller & Dodge) Trappe & A. H. Sm.
   
2. Austroboletus gracilis (Peck) C. B. Wolfe
   
3. Austroboletus subvirens (Hongo) C. B. Wolfe (=A. neotropicalis Singer et al.)
   
4. Boletellus ananas (Curtis) Murrill
   
5. Boletellus russellii (Frost) Gilbert
   
6. Boletus auriporus Peck (=B. atkinsonianus (Murr.) Sacc. & Trott. sensu Halling)
   
7. Boletus firmus Frost
   
8. Boletus flaviporus Earle
   
9. Boletus flavoniger Halling, Mueller, & Gómez
   
10. Boletus flavoruber Halling & M. Mata
    
11. Boletus frostii J. Russell
    
12. Boletus innixus Frost (=B. auriporus sensu Coker & Beers)
    
13. Boletus luridus Schaeff.:Fr.
    
14. Boletus lychnipes Halling & Mueller
    
15. Boletus neoregius Halling & Mueller
    
16. Boletus ornatipes Peck
    
17. Boletus pseudosulphureus Kallenbach
    
18. Boletus quercophilus Halling & Mueller
    
19. Boletus variipes var. fagicola A. H. Sm. & Thiers
    
20. Boletus vermiculosus Peck
    
21. Chalciporus chontae Halling & M. Mata
    
22. Chalciporus sp. nov?
    
23. Gyrodon exiguus Singer & Digilio
    
24. Gyrodon monticola Singer
    
25. Gyroporus castaneus (Bull.:Fr.) Quélet
    
26. Heimioporus ivoryi (Singer) Horak
    
27. Leccinum andinum Halling
    
28. Leccinum monticola Halling & Mueller
    
29. Leccinum neotropicalis Halling
    
30. Leccinum rugosiceps (Peck) Singer
    
31. Leccinum tablense Halling & Mueller
    
32. Leccinum talamancae Halling, Gómez, & Lannoy
    
33. Melanogaster sp. nov.
    
34. Phlebopus monticola Halling, sp. nov.
    
35. Phylloporus aurantiacus Halling & Mueller
    
36. Phylloporus centroamericanus Singer & Gómez
    
37. Phylloporus fibulatus Singer, Ovrebo, & Halling
    
38. Phylloporus phaeoxanthus Singer & Gómez
    
39. Phylloporus "alborufus" M.A. Neves, sp. nov.
    
40. Pulveroboletus ravenelii (Berk. & Curt.) Murrill
    
41. Strobilomyces confusus Singer
    
42. Strobilomyces floccopus (Vahl.:Fr.) P. Karst.
    
43. Tylopilus alkalixanthus Halling & Amtoft
    
44. Tylopilus ballouii (Peck) Singer
    
45. Tylopilus bulbosus Halling & Mueller
    
46. Tylopilus cartagoensis C. B. Wolfe & Bougher
    
47. Tylopilus eximius (Peck) Singer
    
48. Tylopilus griseocarneus C. B. Wolfe & Halling
    
49. Tylopilus obscurus Halling
    
50. Tylopilus violatinctus Baroni & Both