Nothojafnea is a genus of two species of cup fungi. It was originally described by Indonesian mycologist Mien Achmad Rifai in 1968 to contain the type species Nothojafnea cryptotricha, found in Australia. N. thaxteri, known from Chile and Argentina, was added to the genus in 1971. Both species are thought to be ectomycorrhizal; N. cryptotricha associates with Myrtaceae, while N. thaxteri is found with Nothofagus.