The phospholipase activity of 100 oral isolates of Candida albicans was determined by a plate assay. 94% of the C. albicans isolates were phospholipase producers with varying degrees of activity ranging from Pz values of 0.3 to 0.9. As variations in the degree of phospholipase activity on repeat testing of isolates was high it is concluded that the latter criterion cannot be usefully incorporated into a biotyping system of C. albicans.