The name may have changed,Heimiomyces neovelutipes :http://www.indexfungorum.org/... but the paper cited at IF (Segedin et al. 2010- "A nomenclatural checklist of agarics, boletes, and related secotioid and gasteromycetous fungi recorded from New Zealand") only mentions the name change without many details and appears to be for this taxon as it occurs in New Zealand? So I don't know the status of this name as it applies to this taxon here in the US, but it would seam that X. tenuipes would not be that closely related to other Xeromphalina?