Synthesis of silver nanoparticles has been investigated utilizing many ubiquitous fungal species including Trichoderma, Fusarium, Penicillium, Rhizoctonia, Pleurotus and Aspergillus. Extracellular  synthesis has been demonstrated by Trichoderma virde, T. reesei, Fusarium oxysporm, F. semitectum, F. solani, Aspergillus niger, A. flavus, A. fumigatus, A. clavatus, Pleurotus ostreatus, Cladosporium cladosporioides, Penicillium brevicompactum, P. fellutanum, an endophytic Rhizoctonia sp., Epicoccum nigrum, Chrysosporium tropicum, and Phoma glomerata, while intracellular synthesis was shown to occur in a Verticillium   species, and in Neurospora crassa.