Mats Wedin

• Swedish lichenology
• Taxonomic studies in Sphaerophoraceae (Caliciale, Ascomycotina)
• The Lichen family Sphaerophoracae [i.e. Sphaerophoraceae] (Caliciales, Ascomycotina) in temperate areas of the Southern Hemisphere
• world monograph of the genus Plectocarpon (Roccellaceae, Arthoniales)