These are growing in my yard. I think they are White Matsutake. Am I right.
Ted

I would personally need to see the side view as well as the gills underneath..to better determine what you have there.
Looking at the top resembles a parasol mushroom.. from your pic.

No, it's a Lepiota Rhashodes, also called Shaggy parasol mushroom. There are edible varieties an non-edible. It is very easy to tell the good ones. Slice the mushroom, either stem or cap, within a minute or so if the flesh turns an orangish color it is the edible kind. They are fantastic, saute and eat like a steak, along with steak sauce if you want.
They are one of my favorites.
I find those in western Wahington in October, I'm 99.99% sure that's what's what you have; slice and find out.

Definitely not matsutake. You won't find matsutakes growing in your yard. They are associated with older growth pines, firs and spruce.

Wiggle, is this what you were talking about?

^^^^
Yes! Exactly. Those are great eating. Slice and saute in butter and something like Mcormacks steak seasoning.