Most endophytic fungi belong to ascomycetes and fungi imperfecti [2]. The equilibrium between the
host and the fungi seems to be controlled in part by chemical factors, for example herbicidal natural
products produced by the fungi versus antifungal metabolites synthesised by the host plants [2]. There are also reports demonstrating that many antitumour agents such as taxol [3-4] as well as antimicrobial agents [5-7] can be produced by these endophytic fungi. The genus Acremonium sp. was reported by Jeamjitt et al. [8] to be especially capable of producing secondary metabolites. These substances may have applications outside the host plant in which they normally reside. Endophytic fungi have been primarily studied in temperate regions; tropical endophytic fungi are less well understood. Fungi from this unique habitat have been shown to be the sources of new species, possibly containing new bioactive compounds.