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A female patient in her thirties presented with persistent cough and sputum, unresponsive to conventional treatments. Chest imaging showed infiltrative opacities and high attenuation mucus. On laboratory examination, eosinophil counts and immunoglobulin E were elevated. Cordyceps farinosa ,a species of caterpillar fungi, was identified by bronchoscopy and subsequent DNA sequencing from the mucus plug. The symptoms improved after the removal of mucus plugs and cessation of exposure to the work environment. Allergic bronchopulmonary mycosis (ABPM) caused by C. farinosa has not been reported, and its pathogenicity is not well recognized. Herein, we report this case to understand the disease spectrum of ABPM and the pathogenicity of this rare fungi., Competing Interests: Human subjects: Consent was obtained or waived by all participants in this study. Conflicts of interest: In compliance with the ICMJE uniform disclosure form, all authors declare the following: Payment/services info: All authors have declared that no financial support was received from any organization for the submitted work. Financial relationships: All authors have declared that they have no financial relationships at present or within the previous three years with any organizations that might have an interest in the submitted work. Other relationships: All authors have declared that there are no other relationships or activities that could appear to have influenced the submitted work., (Copyright © 2024, Sakano et al.)