Overview of the authors findings from Parana, Brazil. Describes 62 species, of which 55 are new.
Part I: Introduction. Physiography of the region. Localities visited by the second authors. Distribution and numerical abundance. South American Mycenas in literature. Material and methods. Acknowledgements. Part II: Genus Mycena . Key to the sections. 1. Section Sacchariferae . 2. Section Supinae . 3. Section Filipedes . 4. Section Sejunctae 5. Section Caralinenses . 6. Section Aspratiles . 7. Section Dactylinae . 8. Section Polyadelphia 9. Section Infuscatae . 10. Section Fragilipedes . 11. Section Obductae . 12. Section Indutae . 13. Section Saniosae . 14. Section Galactopda . 15. Section Nigrescentes . 16. Section Fuliginellae . 17. Section Insignes . 18. Section Euspeireae . 19. Section Caespitosae . 20. Section Roridae . 21. Section Cerasinae . 22. Section Calodontes . 23. Section Adonideae . 24. Section Granuliferae . 25. Section Notabiles . 26. Section Hiemales . 27. Section Nodosae . 28. Section Exornatae . 29. Section Adornatae . 30. Section Diversae . Part III: Key to the South American species of Mycena described or mentioned by Singer.