Ugh, picture won't go through! It's light green, roundish, about 2 inches or so in diameter. The skin has a rough texture, like sandpaper rough, not bumpy like citrus rind. Thought it was a quince at first, and maybe it is...? Doesn't look quite like the quinces that I'm familiar with.

Is it solid? If it is hollow, it could be an oak gall.

You might be able to upload to Houzz Photos in a folder on the Your Houzz page and then use the Houzz photo button to the right of the regular photo button.

Houzz is aware of the current issue with photo uploads and is working to fix the problem. Makes IDs and photo threads a bit tough, doesn't it?!

I definitely thought it was just me! It definitely makes things a bit more difficult...guess it just makes you evaluate how bad you want to know!

It seems solid to me - it's hard as a rock and pretty heavy for its size, so I would say there's something dense in there. I'll see if I can get the photo uploaded the way you recommended NHBabs.

Source plant is presumably visible somewhere in the vicinity.

Could be the fruit of the flowering quince (chaenomeles) - much smaller than a true quince (cydonia) and can be quite lumpy/bumpy. Really do need a photo, though :-)

Some folks seem able to upload now, so it might be worth another try with your photo. Just put it in the follow-up comments.

Another possibility is calycanthus fruit.

Embothrium, you would think that...but it was discovered by an industrious 3 year old. I walked our whole property but found nothing like it, and I've never seen anything like it in the 5 years we've lived in this house. I'm close with the neighbors, and I've never seen this fruit in their yards either. I'm thinking it may have been dropped on our property by an animal.

NHBabs, I'm going to try again! I've been googling images of quince fruits, and that definitely could be it.

Huzzah! is it a quince?

It actually looks more like a walnut with the husk still on to me. Might you have black walnut trees in your vicinity?

Maybe! Do walnuts smell citrusy/spicy when they're in the husk? That's what really throwing me.

It is for sure not a quince. And I agree with babs that it looks very much like a walnut husk. They are described as having a scent - really of the juglone hormone (crushed leaves will have it too) but some do describe it as spicy or citrusy. Not something I would say is overly noticeable but then not all sniffers are created equal :-))

NHBabs for the win! Did an image search for walnut husks and that is definitely what I have. I never would have guessed that was what a walnut looked like on the tree. Now that I'm looking at pictures of walnut trees, I have definitely seen trees with those leaves nearby. I never noticed the fruit on them though - guess I need to be nosier!

Thank you all for helping me ID this thing! Google could never compete with all the experience in this forum. You guys rock!

Leaves of walnut trees turn yellow in early autumn, well normal autumn that is.

Looks like black walnut. The husk has a spicy pine like scent to me.