ABSTRACTThe influence of the type of carbohydrate and its concentration and of light on fruitbody development inClavicorona pyxidatawas studied. Fruiting was stimulated by transfer of inocula grown on cellophane squares on a nutrient-rich agar medium to a nutrient-limited agar medium. Fruiting began after 6–60 days, depending on the source and concentration of carbohydrate. Fructose and maltose at 20 and 40 g/L produced the highest fruitbody yields, and fruiting was initiated quickly. At these concentrations, glucose produced spindly fruitbodies in significantly lower yields, and fruiting was delayed. A comparative study was made of the effects of glucose and maltose on timing of fruiting and fruitbody yield and morphology over a wide range of concentrations. Fruiting was also investigated on the following carbon sources which produced abnormal fruiting and lower yields: mannitol, sorbitol, cellobiose, cellulose, sucrose, and arabinose. Light was required for fruiting.