1. Introduction
Medicinal plants constitute a source of both traditional and modern medicines [1]. About 80% of rural population depends on herbal medicine as their first line curative medicine. There are reports on the antimicrobial activity of the ethnoveterinary plants [2] and [3] but no reports are available on the antibacterial activity of the fungal endophytes isolated from these ethnoveterinary plants. Rosselle (Hibiscus sabdariffa L.; Family Malvaceae) also known as Ranga tengamara in Assamese is mostly used as an ethnoveterinary plant by the local people of Northeast India to treat various ailments of the livestock [4]. The leaf juice is mostly fed to the animal in empty stomach for the treatment of dysentery. Several reports on the antimicrobial activity of the plant H. sabdariffa have also been reported [5] and [6].