SUMMARY.This article records the occurrence, in the spring of 1920, of the conidial form ofSclerotinia MespiliSchell. on the leaves of medlar trees in four localities in Kent and one in Somersetshire.Mycelium obtained from dead flowers which had remained on the tree from the previous year gave rise to cultures similar to those obtained from conidia taken from infected leaves but theSclerotiniastage of the fungus was not observed.