Unknow fungi growing in my porch

Unknow fungi growing in my porch

Observation - Unknow fungi growing in my porch . Description: About 4-5 inches high Gills extend all the way down the stem rich grey top very tough stem growing in the plywood under the vinyl.

About 4-5 inches high Gills extend all the way down the stem rich grey top very tough stem growing in the plywood under the vinyl.