ABSTRACTThe new combinationValsonectria cinnamomiis proposed and the fungus is studied in culture. Ascospores germinated by forming yeast-like budding cells through fissures, eventually developing small colonies of hyaline conidia which germinated to form hyphae at the colony margins. Hyphae produced conidia holoblastically from numerous loci per cell. Some colonies formed thick, dark brown, mycelial threads composed of loose aggregates of hyphae in which the cells rounded up and disarticulated into arthrospore-like cells. Eventually, colonies produced stalk-like stremata which gave rise to the teleomorph at the apex. No conidiomata were formed.