(S)-23-Hydroxylanostrol, ergosterol alpha-endoperoxide, ergosterol 9,11-dehydroendoperoxide and (23E)-Ianosta-8,23-dien-3 beta,25-diol were sepd. from Lycoperdon perlatum by steam distn. and identified by mass spectroscopy. 3-Octanone, 1-octen-3-ol and (2)-3-octen-1-ol were predominated components of volatiles.