Evidence of termites is always a serious issue. Fungus or dry rot in a bathroom usually are an indicator of some sort of leak or water issue. (May be as simple as water not diverted back into tub/shower from someone that is not property closing the shower curtain & hense shower overspray is running down shower/tub & seeping into flooring & sub floor or there may be a leaking shower connection at the shower drain or other numerous issues, but the inspector would have a better idea on that as to the source of the problem.)
If you are a seller & you had this inspection for a buyer's lender or state requirements, it would be in your best interest's of a sale to correct these issues, unless you have offered your property for sale "As Is" at a motivated price, buyer to make any & all lender required repairs. If that is the case, make the necessary disclosures & advise your buyer. If this sale fails, you will need to disclose this defect to any & all future buyers on your required Property Disclosure Form & any treatments to correct it as you now have knowledge of a material defect.
If you are a buyer, I would ask for the seller to correct these issues, prior to closing & you will want proof that said issues were treated/corrected and re-inspected by the pest inspector after corrections.
22 Years Washington State Real Estate Experience ~ Associate Broker since 1991