Order: Tremellales Family: Tremellaceae
Species: Biatoropsis usnearum
Photos: On Usnea. Glengarriff, Co. Cork, SW Ireland.
Identification confirmed by Brian Coppins
Parasitic, forming small, fleshy, pinkish-orange nodules on the thalli of Usnea species. The basidia have 1-3 transverse septa.
Similar: Cystobasidium usneicola is also parasitic on Usnea and forms similar galls.
Biatoropsis usnearum on Usnea. January 2010