• Magnusantenna Du & Chen, 2021 †
• Magnuscincus Wells & Wellington, 1983 accepted as Ctenotus Storr, 1964
• Magnuscrinus Ausich & Kammer, 2010 †
• Magnusia Klotzsch, 1854 (uncertain) [Family: Begoniaceae]
• Magnusia P.A. Saccardo, 1878 accepted as Kernia Nieuwland, 1916 [Family: Microascaceae]
• Magnusia bartlettii Massee & E.S. Salmon, 1901 accepted as Lophotrichus bartlettii (Massee & E.S. Salmon) Malloch & Cain, 1971
• Magnusia brachytricha L.M. Ames, 1937 accepted as Kernia brachytricha (L.M. Ames) R.K. Benj., 1956
• Magnusia nitida Sacc., 1878 accepted as Kernia nitida (Sacc.) Nieuwl., 1916
• Magnusia spirotricha R.K. Benj., 1955 accepted as Emilmuelleria spirotricha (R.K. Benj.) Arx, 1986
• Magnusiella R. Sadebeck, 1893 accepted as Taphrina E.M. Fries, 1815
• Magnusiella potentillae (Farl.) Sadeb. accepted as Taphrina potentillae (Farl.) Johanson, 1886
• Magnusina O. Kuntze, 1891 (uncertain)
• Magnusiomyces J. Zender, 1925 accepted as Dipodascus G. Lagerheim, 1892
• Magnusiomyces magnusii (F. Ludw.) Zender, 1926 accepted as Dipodascus magnusii (F. Ludw.) Arx, 1978
• Magnussoniolichen Tomaselli & Ciferri, 1952 accepted as Polyblastia A. Massalongo, 1852
• Magnussoniolichen rupifragum (A. Massal.) Tomas. & Cif., 1952 accepted as Staurothele rupifraga (A. Massal.) Arnold, 1880
• Magnussoniomyces Ciferri & Tomaselli, 1953 accepted as Polyblastia A. Massalongo, 1852