SUMMARY
Mycelia of five ectomycorrhizal fungi—Hebeloma sarcophyllum, H. crustuliniforme, Suillus cothurnatus, Pisolithus tinctorius, and Cenococcum graniforme—growing in vitro were analyzed for fatty acid composition by GLC and TLC methods. The major fatty acid in each fungus was a di-unsaturated 18-carbon acid; 16: 0 and 18:0 fatty acids were also present in each fungus; and an 18: 1 fatty acid was detected in all fungi except S. cothurnatus.