Hericium erinaceus
This example of Hericium erinaceus was about 18 cm across and had
spines or teeth that were 4 cm long.  Found in October growing from
recently cut timber in the Morgan-Monroe State Forest (Morgan County).
See Hericium erinaceus at
Fungi Growing on Wood.
Hericium erinaceus
A young specimen; 10cm across.