| | Re: pollinating anubias
Different variants within a species are definitely crossable (for instance, I just recently purchased an A. barteri var. glabra x caladiifolia). Cross-pollinating distinct species is more of a trial-and-error thing, though... naturally, the more closely related the two species, the more likely hybridization is possible.
So, in short, which two Anubias are you trying to cross?