Which of the following groups of plants play an important role in plant succession on bare rocks/soil ?

Bryophytes play an important role in plant succession on bare rocks/soil. Bryophytes include the various mosses and liverworts that are found in moist shaded areas in the hills. Moss stage is the second stage in biological succession on a bare rock that slowly changes rocky substratum into fertile soil. Important members of moss stage are Tortula, Grimmia and Polytrichum.