In situ and in vitro appearance of three fungi sometimes associated with root rot in tomato soilless culture but whose aggressiveness has never been proven on this Solanaceae. Olpidium brassicae resting spores aligned in several root cells (A), Plectosporium tabacinum bicellular conidia within root cortex cells (B), phialides of Plectosporium tabacinum (C), aleuriospores (dark brown) of Humicola sp. (D), phialides of Humicola sp. perpendicular to the mycelium; they form chains of conidia (E).