Hello Stanley,

MSU Extension does not identify mushrooms due to toxicity and health risks. The whitish fungi looks like a type of dried out slime mold. These are common on woody mulches and other areas of high moisture and organic matter.

Here is a link which has resources on Michigan mushrooms. This might help you find classes in mushroom ID if you are interested.

http://michiganmushroomhunters.org

There is no practical way to completely prevent mushrooms. There are thousands of types. Your picture shows types that commonly grow on tree roots and stumps. Tree roots are extensive, spreading wider underground than the tree's leafy canopy did. They can take decades to break down, and the mushrooms you see are the fruiting body of the fungi that break down woody material.

Here is some information on managing mushroom growth---

Small, soft mushrooms - mow or rake them and dispose in the compost pile or garbage. If pets or small children are a concern, sealed in the garbage is the safe way to go. Always assume mushrooms in the lawn/garden are poisonous when consumed. For tough or hard mushrooms- dig and dispose as above.

Redirect your sprinklers away from already shady, wet areas, and run sprinklers so that the problem area has enough day-time hours to dry before sunset.

If shrubs and trees provide shade to the area, consider pruning them so more sunlight reaches the area, if your perennials there can take more sun, too. If a specific section of lawn has old stumps and roots, dig them out to reduce the woody material mushrooms grow on. Landscape timbers can be a source for mushrooms to grow.

We have had a quite wet season in Michigan, and as rainfall varies, so will the prevalence of mushrooms sprouting in the garden.

Here are some links to discouraging 'nuisance mushrooms' in the yard.

http://msue.anr.msu.edu/news/identifying_mushrooms_there_is_more_to_it_than_you_might_realize

https://ugaurbanag.com/controlling-mushrooms-and-other-fungi-in-the-landscape/?doing_wp_cron=<personal data hidden>.<personal data hidden><personal data hidden>

I hope this information is helpful.