I assume this is a Mulberry tree?

Any idea what type? Morus rubra...alba...nigra...papyrifera L...hybrid...etc?

Trunk: http://oi57.tinypic.com/264roua.jpg
Leaves: http://oi60.tinypic.com/21lpyjn.jpg

"If the leaf is short and the base is heart-shaped, it is probably a black mulberry leaf. If the leaves have rounded teeth on the edges, it is either white or red mulberry; white mulberry leaves are glossy while red ones are less so. If the leaf is densely hairy, it comes from a paper mulberry tree."
http://www.ehow.com/how_5530428_identify-mulberry-tree-leaf.html

"The Texas mulberry resembles the red type, but is about one-third its size."
http://www.ehow.com/way_5260804_mulberry-tree-identification.html

"White, red and black mulberry trees have lobed leaves, but the white mulberry's leaves have a wide variety of lobe patterns, even on the same tree, with some leaves that may not be lobed at all."

Here is a link that might be useful: How to Identify a Mulberry Tree Leaf