I don't have too many Dens, but most are species
atroviolaceum (v pygmy)
bigibbum (v compactum)
kingianum (tipo and silcockii)
victoria-reginae
spectabile (seedling)
nobile (keikis given to me last summer - one's blooming now)
have killed:
lawesii
moschatum (honestly, I had the moschatum a few years, never bloomed, then just up and died)
moniliforme
I had avoided Dens for a while - with so many different types, they seemed intimidating to me, but the ones I have now, at least, are all very rewarding