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Hi, to answer your second question first, it's a new growth, for the plant to go to sheath, it has to be as mature as the growths next to it. You did the right thing in taking it to the shop for advice, they were right, it does look like a fungal problem, I'd use their advice & use the physan as recomended. You'll know it's been successful when the black disappears, & the affected part of the growth becomes a dried (to the touch) brown. When it grow out some, cut the dried brown tissue back 1/2" in to green healthy tissue & treat the cut with diluted physan on a Qtip. You might find it nessary to treat it a few more times to be completely successful, I keep a small spray bottle handy for such emergencys. Orchids don't do well in stagnant air & high humidity So, I'd suggest adding a fan in the growing area (if you don't already have one) to lightly keep the air moving. This will also help to keep bacteria & fungus from settling on your plants.
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