Byssomerulius is a widely distributed genus of crust fungi.

Taxonomy: Byssomerulius was circumscribed by Estonian mycologist Erast Parmasto in 1967. Although traditionally classified in the family Phanerochaetaceae, recent molecular phylogenetic analysis supports the placement of Byssomerulius in the Irpicaceae.

Species: 

• Byssomerulius albostramineus (Torrend) Hjortstam (1987) – United States
• Byssomerulius armeniacus Parmasto (1967)
• Byssomerulius auratus (Bourdot & Galzin) Tura, Zmitr., Wasser & Spirin (2011)
• Byssomerulius corium (Pers.) Parmasto (1967) – widespread
• Byssomerulius flavidoalbus (Corner) Hjortstam (1995)
• Byssomerulius hirtellus (Burt) Parmasto (1967) – Europe
• Byssomerulius incarnatus (Schwein.) Gilb. (1974) – Bolivia
• Byssomerulius pavonius (Sw.) Zmitr. & Malysheva (2006) – Brazil
• Byssomerulius pirottae (Bres.) Hjortstam (1987)
• Byssomerulius psittacinus P.K. Buchanan, Ryvarden & Izawa (2000) – New Zealand
• Byssomerulius rubicundus (Litsch.) Parmasto (1967) – Austria; Finland
• Byssomerulius salicinus Parmasto (1968)