i believe a got an answer for both leaves, and learning something new

the first one is a mulberry tree, the other a black walnut here is what i posted on facebook,
i just went for a walk at a state park , found the same tree and went to the forestry office and ask, he believed it to be black walnut, i ask why would it be white, inside, he said , it has to be three inch wide to see the center cord will be dark or black so i believe all those trees to be black walnut,

thanks to all that tried to help with an answer, i will try to carve the black walnut and see how it will carve, see you always can learn something new