are closely related, many have assumed that members of a forma specialis are also closely related and descended from a common ancestor. However, results from research conducted on ''Fusarium oxysporum'' f. sp. ''cubense'' forced scientists to question these assumptions. Researchers used anonymous, single-copy restriction fragment length polymorphsims (RFLPs) to identify 10 clonal lineages from a collection of ''F. oxysporum'' f.sp. ''cubense''