Language: English
Volume 39 contains the following papers:
- Type studies in Polyporaceae 33, species described by P. van der Byl, L. Ryvarden
- Type studies in Polyporaceae 34, species described by C. Torrend, L. Ryvarden
- Type studies in Polyporaceae 35, species described by C. Peck, L. Ryvarden
- Type studies in Polyporaceae 36, species described by E. Fries, L. Ryvarden
- Studies in Aphyllophorales of Africa 28. Some corticoid species from Malawi, V. Spirin & L. Ryvarden
- Studies in Aphyllophorales of Africa 29. Some corticoid species from Uganda, V. Spirin & L. Ryvarden
- Studies in Aphyllophorales of Africa 30. Some poroid species from Uganda L. Ryvarden
- Studies in Aphyllophorales of Africa 31. The genus Tyromyces in Africa, L. Ryvarden
- Studies in Aphyllophorales of Africa 32. Some new African polypores, L. Ryvarden
- Studies in Aphyllophorales of Africa 33. Two new poroid species from Cameroon, Metsebing Blondo-Pascal, Tsigaing Fabrice, Oba Romuald1 Mossebo Dominique Claude & Leif Ryvarden
- Studies in Aphyllophorales of Africa 34. Two new species from Cameroon and the Democratic Republic of Congo, Tsigaiing, Tsigain Fabrice, Oba Romuald, Metsebing Blondo-Pascal, Mossebo Dominique Claude, Fomena T. Mélanie Claire, Lumanda Kasali Joseph & Leif Ryvarden