Different scenarios investigated, fossils used, ages for each fossil and distributions associated with the selected fossils.

Exponential distribution = Exp (offset, mean). The means were selected so that 97.5% of the prior probability for each fossil date would fall below the age of the major group the fossil belongs to, i.e. 400 Mya which is the age for the †Pezizomycotina crown and 650 Mya for the ‡ Ascomycota base, both according to [32] and 160 Mya which is the age of the * Lecanorales based on [59].