Endophyte assemblages are composed by rare or singleton species which are isolated only once or very few times, and by dominant or plural species which are frequently isolated from a given host species (e.g. Neubert et al., 2006). Singleton species are the main factor driving non-asymptotically species accumulation curves. When the singleton species found in a survey are excluded from the data used to plot a species accumulation curve, the resulting lines may be asymptotic