Dry and steep slopes are severe habitat for ferns to establish because fern spores are susceptible to washout by rainfall and fern gametophytes are hard to obtain water. We focused on presence and structure of bryophyte communities to facilitate fern gametophyte to establish on steep slopes. We examined bryophyte coverage and presence of young sporophyte of Crypsinus hastatus in 1600 grids (grid size is 50mm x 50mm). Relationship between density of fern gametophyte and structure of bryophyte communities was also examined. Young fern sporophytes occurred more frequently in grids with higher bryophyte coverage. This result indicates that bryophyte community would keep wet condition suitable for the growth and fertilization of gametophyte and prevent spores from washout by rainfall. Density of fern gametophyte was higher in Blepharostoma minus community than that in Taxiphyllum taxirameum community. Gametophyte would develop their rhizoids on to the soil surface in B. minus community with small and linear body growing upright, whereas tall and thick body of T. taxirameum community may hinder rhizoids from penetrating to soil surface and shade gametophyte to prevent the growth.