A variety of relationships can coexist between endophytes and their host plants, ranging from mutualism or symbiosis to antagonism or slightly pathogenic (Schulz & Boyle 2005, Arnold 2007, Purahong & Hyde 2011). The host-endophyte relationships can be described in terms of host-specificity, host-recurrence, host-selectivity, or host preference (Zhou & Hyde 2001, Cohen 2006).