Fungi are ubiquitous and are known to occur on diverse habitats. Among them the leaf inhabiting fungi are known as ‘foliar fungi’ (Dix and Webster, 1995). These fungi are mostly host specific and produce spots or lesions of varied types such as mildews, tar spots, rusts, scab etc. The nature of colonization by these fungi depends on season, age of the plant and nutritional status of the leaf (Last and Deighton, 1965; Dix and Webster 1995). The present study deals with diversity of foliar mycobionts on Strychnos nux-vomica L. (Loganiaceae) from Vettikulam sacred grove, Pathanamthitta, Kerala. This paper deals with the detailed microscopic examination of the fungi namely; Meliola strychni-multiflorae Hansf., Meliola strychnacearum Hosag. & Abraham, Meliola strychnigena Hosag. & Manoj., Meliola strychni Mibey and Questieriella strychni Hosag. The collections were identified and deposited in the fungal herbarium of S. G. College, Kottarakara.