The response of P. myriotylum to E. adenophorum oil extracts was observed using a light microscope at 400x magnification. P. myriotylum mycelia treated with 80 μg/ml oil extracts were compared with an untreated control. Compared with the control, hyphae exposed to the oil extracts were substantially modified (Fig 5). Untreated mycelia developed regular and homogeneous hyphae (Fig 5A). Compared with the control, mycelia treated with oil extracts produced larger diameter hyphae; a more heterogeneous distribution of the cytoplasmic matrix; more cytoplasmic granulation; less cytoplasmic matrix; and more decay of the cell wall (Fig 5B).