Wood veneer ID on a LCW  

Oak
Oak

.
5 "stitched' pieces of veneer on the seat, are larger pieces that unobtainable?

I see four to one...
I see four to one book-matched. Most veneer isn't all that wide but would have to be VERY wide if the manufacturer went the next step "down" of two to one.

.
Peeled can come very wide, but I suppose its sliced for better grain, they are either coming from slimmer logs or close to the start or finish of the slicing process, a shame, I think.

Ash
With a nice patina.

I thought recent productions ...
I thought recent productions only came in walnut, cherry, santos palisander, red, black, and light/white ash (which look very different from this veneer). Even Herman Miller's website doesn't seem to have a choice that resembles this veneer. Can someone please explain that? Thanks.

Looks like Ash to me
Check the manufacture sticker for verification.

Woody already has.
Both the wood and the finish darken with age. It's ash, most assuredly.

Peeled veneer
would never yield the repeated and symmetrical plain-sliced patterns we see in book-matched veneered surfaces. The four leaves we see here are not excessively narrow, in my view. Readers should not view veneered surfaces as some sort of inferior version of solid wood, any more than they would expect the potato-chip seat and back to somehow be hewn from a single log . . .
On the other hand, it could be argued that a larger and perhaps asymmetrical surface pattern would not be out of place on this chair. It is a more-or-less accepted principle in woodwork that, the more more complex the form, the plainer should be the grain pattern -- and, to some extent, vice versa. The pony-hide (?) version of this chair would be the extreme example. That raises the question, "Is this chair a simple or a complex form ?"
We've all seen ash-veneered DCMs and DCWs that we liked more than this chair; perhaps the grain was wilder (though still balanced) in some earlier examples. In retrospect I'm not sure a peeled hardwood one-piece veneer would be wrong for this design . . .

Wow, you guys are so knowledg...
Wow, you guys are so knowledgable. For this chair it doesn't have the paper sticker that identifies the veneer but it sounds like the consensus is ash. When they say light or white ash nowadays, does it mean the dye?

Common name for Fraxinus americana.
The internet is a wonderful place.
http://www.hobbithouseinc.com/personal/woodpics/ash,%20white.htm

Thanks tktoo!
I will bookmark that site, as I know so little about wood species, especially ash.
Best, and many thanks...
Aunt Mark

Mark,
if you scroll down that page far enough, you will come across a "curly white ash crotch bowl" which, I think, I could never use as a serving piece.
Same goes for the "curly crotch platter".

I had a date once that had the same curly crotch situation.
I didn't know what to think????
Live and learn...,
Aunt Mark