Here it is.

Acer pensylvaticum?

tj

I think the petioles are a different color. I had a pensylvaticum once, and if I remember correctly, the leaf stems were green and the striping was different.
Mike

Best of luck with this one Mike.This year suddenly snake bark maples have appeared over here in garden centres,never seen this before,often labelled as Japanese Maples.Many different species with similar leaf shapes but are cultivated versions.Anyway it's good to see more varieties of species.

Well,just by looking on the web,there are many photos of Acer Capillipes which look identical to yours regarding leaves,petioles and bark so I think you've probably nailed it though my experience with them is zero ha(I've only got one)

Having seen many Acer pensylvanicum in the wild, I'm fairly comfortable saying that your tree is not Moosewood Maple. I agree with Acer capillipes,

Thank you very much.

It's good to get firsthand info from knowledgeable people.

Mike

Moose wood is of the same set as A. rufinerve and A. tegmentosum. Ones like yours are more on the order of A. capillipes and maybe A. grosseri. (A. davidii ssp. grosseri).

A. capillipes is unusual among the species in this part of the genus (Sec. Macrantha) in tending to come true from seed (otherwise there is a problem with stripe bark maple seed from planted collections tending to be hybrid).

You can find A. capillipes to compare yours with, check your identification at the Seattle arboretum and the Kruckeberg Botanic Garden.

OK, thanks, Ron.
I used to live within walking distance of the Kruckebergs in the 50s. Didn't even know who he was, but admired the young Doug Firs and Salal there. I have his book on the natural history of the Puget Sound country. I would recommend it to anyone that wants to know the complete background of this region. Very well written.
https://www.washington.edu/uwpress/search/books/KRUNAT.html

Mike