Fern, New York (Thelypteris Noveboracensis)


Thelypteris noveboracensis is common in sunny patches caused by canopy gaps in mixed woodlands, near vernal seeps, at the edge of swamps, and along streams. Once soil pH levels decline below 4.1, this fern can become a dominant understory species. In such situations, it may outcompete the seedlings of certain tree species, some of which are commercially important. The seedlings of black cherry are especially vulnerable, as the fern releases an allelopathic phenol  which can kill them.

This fern is a wetland indicator.