Hi, I have some houseplants which have developed a white fungus in patches in the soil. Not on top of the soil. Down inside. In some cases, the fungus grows to fill the entire pot. The fungus is extremely water repellant, and one of my concerns is that when I water, I end up with huge dry patches where the fungus is present. At first, I noticed the fungus in soil that had a fair amount of chunks of ground bark, and I assumed that it was a fungus growing on the decaying bark. I removed those plants. However, the fungus has spread to other pots which don't have any visible bark in them. The spores of the fungus seem to just be generally present in the room. I tried getting rid of all of the soil that was infested, but the fungus keeps appearing on new plants. I'm a fanatic about not overwatering, and always check the soil to be sure that it is at the proper state of dryness for the particular plant before I water, and I drain excess water out of each pot before I put it back in its place (I tip each pot up and let any excess water drain out into a waste bucket). The room has pretty good ventilation, usually too much, rather than too little. I clean everything that I use on the plants with rubbing alcohol in between each use. Most of the plants with affected soil are African violets, but also several calatheas, some ferns, and a few hoyas. Most seem to be growing well, but at least with the calatheas, if the fungus fills the pot, the plants begin to die back. They never die completely. They keep putting up new growth, but they never grow lushly in the soil with the fungus. I also have several orchids growing in open, bark-rich orchid mix, intermixed with the other plants. Interestingly, none of the bark/mix in the orchid pots has developed the fungus. Not a single one, ever. From what I read, the fungus ought to be harmless to the plants, only feeding on the decaying organic material. But the extent of it, and the water-repellant properties are beginning to worry me. Any ideas? Thanks!