Getting rid of fungus on orchid mounts?

[nancy]

Greetings -
It has been an unusually wet summer, even for south Louisiana, and September is predicted to be more of the same - a daily soaking; sometimes days of drizzle. This too-much has led to an unexpected problem for me; I grow almost everything on a mount of some kind. I haven't had problems with orchids rotting (or liquefying), but am beginning to have fungus problems on the wood mounts themselves (mostly grapevine, also cork, catalpa, cedar, etc.). The growths include several kinds of typical mushrooms as well as some bract/tree-ear types; some even look like lichens.
In my arsenal I have liquid Physan, and Bordeaux and elemental sulfur powders - will any of these help? I suppose these are a type of mycelium, rather than what I think of as a typical fungus.
If not, then what can I try?
Thanks - Nancy