Identification: Hard white fungi in lawn

which fungi is this?

 

These look like they might be irregular growths of Ganoderma mushrooms arising from buried wood. The species would be difficult to determine without more info.

 

Largest one is about 1 foot across. Texture a bit like gypsum board….yes, a tree was removed so yes, roots likely being broken down.

 

Key here doesn’t seem to match up…:

The Genus Ganoderma (MushroomExpert.Com)

 

Although yes this certainly looks like a laccate Ganoderma, growing a bit oddly ... because the growth pattern is very like Onnia tomentosa, I'd like to ask @Polar2 : Was the removed tree a spruce?

 

I’ll find out in the morning and let you know.