Crocker Range Park ranks the second highest (cf. Table 4) in terms of number of mosses reported from mountainous areas in Borneo (Frahm et al. 1990, Suleiman and Edwards 2002, Suleiman and Akiyama 2004, Higuchi et al. 2008, Akiyama et al. 2001, Andi et al. 2015, Suleiman et al. 2011b). CRP recorded about 40% of the mosses reported from Borneo although the highest point in CRP is only 2,076 m a.s.l. This indicates that CRP has high species richness of mosses, second to that of Mount Kinabalu. Meanwhile, the number of mosses on Mount Trus Madi and Mount Lumaku were much lower, with 26% and 17%, respectively. Although Mount Trus Madi is much higher in terms of elevation, the number of mosses reported from the mountain was far lower than from CRP. Mount Lumaku, on the other hand, has a similar height to the highest peak of CRP but its species richness is only about half that of CRP. Two of the contributing factors are that CRP receives a high annual rainfall and it has a relatively larger area of pristine primary lowland forests than Mount Trus Madi and Mount Lumaku. Nonetheless, a diversity study should be carried out to determine the true diversity of these areas.