Fatty acid composition of Vietnamese black lingzhi, Amauroderma subresinosum was investigated by GC (Gas chromatography) with authentic samples. Fourteen fatty acid s were identified, in which the concentration of unsaturated fatty acid , 11-octadecaenoic is the highest (around 51.01% of total fatty acid s). Furthermore, two fatty acid s, lignoceric acid and 11-octadecaenoic together with three esters of cholesta-7,22-dien-3β-ol with three fatty acid s 14- methylpentadecanoic, 8,11-octadecaenoic and 8-octadecenoic with the ratio 1/1/1 were isolated and structural elucidated. These results support a new evidence for classification of Ganodermataceae family, in which A. subresinosum is placed in the distinct genus Amauroderma , isolated from Ganoderma , since it does not produce any triterpenoid, typically elaborated from Ganoderma species, particularly G. lucidum .
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