Might be Tree Parasites?

I saw these leaves on the parking lot when I picked up Charlie from Camp. I don’t think they are a good sign but I’m not sure. I tried to identify them. Maybe a blog reader will know.

Do you know what the bumps are under these leaves?

Happy Thanksgiving

Thank you for stopping by the blog today and please know I’m grateful for your making time to look at the photo of the day.

I received two lovely Thanksgiving cards, the bottom l and r. Thanks dc and Carrie, two wonderful blog followers. (The other 4 cards I bought to send out- didn’t get them mailed. 😥)
Thank you to my dear friend for this thoughtful card ❤️

Japanese Maple Leaves

Japanese maple (Acer palmatum) after the rain on Sunday. The colors were so rich.

“The Japanese word “momiji” is sometimes applied to this tree in its native land. The word is said to have two meanings, both of them appropriate for the description of this wonderful tree: “baby’s hands” and “becomes crimson leaves.” Arbor Day Foundation website