Glad to hear you have the simultaneous blooms LariAnn (good luck) and sorry to hear about the T trilobatum hybrids lack of pollen. Are these yours? Is it likely or possible they will produce pollen in future years? Since your work is so diverse I had to re-read
Typhoniums - Growing and Hybridizing these lesser-known Aroids to refresh my memory.
With Sauromatum being revitalized, I guess your job got harder last year since you're no longer doing solely inter-specific crosses on Typhonium.
So you've added even more Typhonium species, with T. varians in the mix your breeding area must look a wondrous mess.