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Aims  Emission of toxic metabolites in guttation droplets of common indoor fungi is not well documented. The aims of this study were (i) to compare mycotoxins in biomass and guttation droplets from indoor fungi from a building following health complaints among occupants, (ii) to identify the most toxic strain and to test if mycotoxins in guttation liquids migrated trough air and (iii) to test if toxigenic  Penicillium expansum  strains grew on gypsum board.    Methods and Results  Biomass suspensions and guttation droplets from individual fungal colonies representing  Aspergillus, Chaetomium, Penicillium, Stachybotrys  and  Paecilomyces  were screened toxic to mammalian cells. The most toxic strain, RcP61 (CBS 145620), was identified as  Pen. expansum  Link by sequence analysis of the ITS region and a calmodulin gene fragment, and confirmed by the Westerdijk Institute based on ITS and beta‐tubulin sequences. The strain was isolated from a cork liner, was able to grow on gypsum board and to produce toxic substances in biomass extracts and guttation droplets inhibiting proliferation of somatic cells (PK‐15, MNA, FL) in up to 20 000‐fold dilutions. Toxic compounds in biomass extracts and/or guttation droplets were determined by HPLC and LC‐MS. Strain RcP61 produced communesins A, B and D, and chaetoglobosins in guttation droplets (the liquid emitted from them) and biomass extracts. The toxins of the guttation droplets migrated  c.  1 cm through air and condensed on a cool surface.    Conclusions  The mycotoxin‐containing guttation liquids emitted by  Pen. expansum  grown on laboratory medium exhibited airborne migration and were >100 times more toxic in bioassays than guttation droplets produced by indoor isolates of the genera  Aspergillus ,  Chaetomium, Stachybotrys  and  Paecilomyces.Significance and Impact of the Study  Toxic exudates produced by  Pen. expansum  containing communesins A, B and D, and chaetoglobosins were transferable by air. This may represent a novel mechanism of mycotoxin dispersal in indoor environment.

journal of applied microbiology

Penicillium expansum  strain isolated from indoor building material was able to grow on gypsum board and emitted guttation droplets containing chaetoglobosins and communesins A, B and D