Pertica quadrifaria

is the state fossil of Maine.
==Description==
Pertica is a genus of extinct vascular plants of the Early to Middle Devonian (around 420 to 380 million years ago). It has been placed in the "trimerophytes", a strongly paraphyletic group of early members of the lineage leading to modern ferns and seed plants.
==State Symbol==
Its status as state fossil was adopted by the Legislature of 1985. 
==References==
Category:State Symbols
Category:Maine