WHAT ARE THOSE THINGS ?!?!?

OK... So, at the park where I sometimes eat my lunch, I found TONS of these... Probably somewhere between 50-75 of them laying on the ground under a large grove of trees (many different kinds of trees, and NONE have any of these hanging on them).
They appear to be seed-pods of some form.
About the size and weight of a softball.
If the surface of the unit is disturbed, they ooze a white, sticky, gooey juice .

Kelly sliced one in half to see what the inside was like.

No single stone-type pit and not any other kind of visible seeds of any type.

Just a fibrous and somewhat stringy looking material that follows in the 'brain-matter' pattern that is on the outside of them.

Anyone have any clue?

I haven't dedicated much time in my 'research' into them, just thought I'd throw it out there for conversation.

TTFN

(Please take note of the extensive vocabulary of technically correct and highly scientific words that I used!)