 In the cap, linoleic acid made up 50.7% of the total lipids (65.7% in the stipe), oleic acid was 29.9% (12.4% in the stipe), followed by palmitic acid at 10.5% (12.6% in the stipe).Linoleic acid—a member of the group of essential fatty acids called omega-6 fatty acids—is an essential dietary requirement for humans.Several "Suillus" species which grow under pines could be confused with "S. brevipes".