Imagine a hypothetical forest like the one you simulated, where medium-sized fire disturbances occur with intermediate frequency. Initially all plant species are susceptible to burning in a fire. One group of species develops resistance to fire disturbance, in that they henceforth survive fire events. Which group of species, if they develop such resistance, should have the greatest impact on the long-term dynamics of succession

Mosses or lichens are the group of species have great impact on the long term dynamics of succession if they develop resistance against fire events because these species can used the ashes of other plants as a nutrients for their growth and development. These group of species spread at a higher rate which covers most of the area of the forest and become a dominant species in the forest. Due to the presence of these species, the organisms who feed on these species comes to these forest and slowly the diversity of the forest is attained.