Undoubtedly. Although I don't recall that I've ever seen an Ackermanni quite as old as yours, I have no idea exactly what size the flowers could reach on such a mature specimen. It is interesting to explore. I did see that E. Ackermanni has been transferred to the Disocactus genus. They do that all the time with these plants. Drives me nutty, but it's good to be accurate.
