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You didn't describe the fungus or where your violets are growing. If they are outdoors in the ground and the soil is moist, it's probably moss. You can peel it up off the soil surface and then lightly cultivate the soil to incorporate some fresh air so it will dry out faster. You can also mulch over the soil surface with some compost.
If the violets are growing in pots, it could be that what you are seeing is not fungus but a white coating over the top of the soil that is actually salt buildup. This can come from the minerals in water or could be residue from fertilizers. This, too, can be scraped off the soil surface. To prevent this problem in the future, simply leach the salts out of the soil by periodically flooding the soil, allowing to drain and flooding twice more. This is generally enough to leach minerals out of potted plants.
Hope this answers your question!
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