Some methods are described for isolating and culturing Exobasidium species. Detailed descriptions are given of cultures of Exobasidium japonicum Shir. Exobasidium rhododendri Cram. Exobasidium vaccinii (Fuck.) Wor. Exobasidium vexans Mass. Successful inoculation experiments of. Exobasidium vaccinii are reported, the fungus being re-isolated from the hypertrophies it had caused on Vaccinium vitis-idaea.