Per 'Characterization and Genetic Relationships of Wild Species and Old Garden Roses Based on Microsatellite Analysis' (Scariot, Akkak and Botta, J. Amer. Soc. Hort. Sci. 131(1):66-73, 2006), R. x centifolia 'Rubra' was found to be genetically indistinguishable from Crested Moss, suggesting that either the latter is a sport of this rose, or both are sports of a single parent.
Thank you for bringing this to our attention. The classification should be "centifolia" according to MR 11. I have corrected the listing in the HMF database.