ABSTRACT
The sterols of ten species of Oomycetes and two of Hyphochytridiomycetes were analyzed following normal growth. Some of the fungi were also grown on a lanosterol or cycloartenol supplement. The sterol content of most species examined was similar to those found by other investigators, except that sterols of the ergostane series were also observed. A new sterol was detected in one species. In general, the organisms showed a preference for cycloartenol rather than lanosterol utilization. This preference is discussed as a potential tool for delineation of phylogenetic relationships.
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