Abstract
The sesquiterpenes formed in the fruit bodies of Lactarius vellereus and L. bertillonii as a response to injury have been investigated. The two species are very similar, and intact fruit bodies contain the same sesquiterpenoid precursor, stearoylvelutinal. In L. vellereus this is converted to isovelleral (major component) and velleral, which subsequently are reduced to isovellerol and vellerol. In L. bertillonii, only velleral is formed as a primary product; it is subsequently reduced to vellerol which is oxidized to the end product vellerolactone. The results support the proposed removal of the taxon bertillonii from L. vellereus and its treatment as a separate species.
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