Comments: Major threats to Dudleya cymosa ssp. marcescens are rock climbing and rappelling, other recreational activities (such as damage from informal climbing, boulder hopping, and substrate removal at gathering sites), and residential development (half of the occurrences are on private lands) (USFWS 2009). Other threats are conversion of private land to agriculture, horticultural collection, and wildfires which tend to burn much more widely and intensely than Dudleya cymosa ssp. marcescens is adapted to (USFWS 2009). Climate change is also listed as a possible threat but the extent of this threat is not yet known (USFWS 2009).