Onychomycosis, the fungal infection of nail is a common occurrence. The conventional fungi implicated are dermatophytes and Candida species. Non-dermatophytic moulds account for few cases and Chaetomium globosum is an exceptional agent. This characteristically involves the toe nails which are dystrophic and discoloured yellow-brown. Direct microscopy shows brown septate hyphae. Isolate is rapidly growing, grey-brown mould with characteristic osteolate perithecia surrounded by brown septate setae. Perithecia discharge lemon shaped, brown ascospores. Chaetomium being a soil saprophyte may escape identification as a pathogenic agent. We describe the case of a 50 years old female with onychomycosis of toenails by Chaetomium globosum.
onychomycosis, Chaetomium globosum, nail, perithecia.