Xerocomic acid is a red-orange pigment found in fungi of the order Boletales (and is named after the genus Xerocomus). It is the precursor to variegatic acid, and is preceded by atromentic acid and atromentin.[1]. As an example, it is isolated from Serpula lacrymans. It is soluble in methanol. An oxidase acting on xerocomic acid is responsible for the "bluing" reaction seen in mushrooms.

Xerocomic acid
3D model (JSmol)
Molar mass 356.286 g·mol−1
Melting point 295 °C (563 °F; 568 K)
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references

Condensation of two units of xerocomic acid form the pigments sclerocitri, badione A, and also norbadione A, which are found in the mushroom Scleroderma citrinum Pers.

Variants include isoxerocomic acid and O-methylxerocomic acid.[1].

O-Methylxerocomic acid


  1. ^ a b Gill, M., and Steglich, W. (1987) Pigments of fungi (Macromycetes). Prog Chem Org Nat Prod 51: 1–317.