Fulvifomes siamensis was initially described from Thailand and has been reported from several parts of Southeast Asia. In the present study, basidiomata of F. siamensis were collected during macrofungal surveys conducted in Thiruvananthapuram District of Kerala, India. The specimens were found growing on Peltophorum pterocarpum. Identification was based on detailed macro- and micromorphological characters, as well as molecular phylogenetic analyses using the nrITS and nrLSU gene regions. The Indian collections were confirmed to be conspecific with F. siamensis. This study presents the first report of F. siamensis from India, supported by comprehensive morphological descriptions, illustrations, nrITS–nrLSU-based phylogenetic analysis, and comparisons with closely related taxa.

Keywords: Basidiomycota, Hymenochaetaceae, India, morphology, nrITS, nrLSU, phylogeny, taxonomy

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