nomocharis black leaves

[Diane Clement]

I have a couple of Nomocharis with black markings on the leaves.  Is this a virus, or fungus? 
Should I destroy the plants?

[Carlo]

Diane,

Just a guess but it looks more like a cultural problem to me. If you're concerned, cut the leaves off with a sterile blade and keep an eye on the plant to see if the problem spreads...

[Andrew]

I have a Dactylorhiza with the ends of the leaves turning black. On investigation the pot was rather water logged, not suprising the amount of rain we have had here lately !