Thank you both.
David, I hadn't realized that tigrinum sometimes grew as an epiphyte. I had such trouble with it over and over. It kept getting rotten roots. Then, this chunky, very open mix of CHC, pea gravel and a lot of chopped up styrofoam peanuts did the trick and it finally came back from the brink. As the last old growth died away, a new growth (the one blooming now), came up; but, it was slow to grow at first. As new roots grew, the new growth began to grow faster. Then, last fall, about the time that the bud appeared, a new start poked up. Now there's a second start just behind the first one. So, I'm hopeful that it will be happy now and begin to clump over the next couple of years. I'm tempted to self it; but, I won't. I'll let it grow and make a few more fans first. Although, I will use the pollen on other plants.