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Thelypteris noveboracensis
''Thelypteris noveboracensis'', or the New York fern, is a fern found throughout the eastern United States and Canada. It is distinctive by its pinnae tapering to the base of the frond, and by its forming extensive clonal colonies on ridgetops and mountain benches. The only other native species in this area with similarly tapering pinnae is the ostrich fern, ''Matteuccia struthiopteris'', which generally grows in riparian habitats. The only other species that forms as extensive clonal colonies is the hay-scented fern, ''Dennstaedtia punctilobula''.
This fern grows in clumps of three or more fronds along a dark brown, slightly scaly rhizome, unlike the very similar ''Dennstaedtia punctilobula'', which grows in lines. The blade is long, yellow-green, and tapers at either end. It produces both fertile and sterile fronds. The fertile fronds are larger and more upright, and produce a few small, round sori near the margins of the pinnae. These sori are covered by a tan, kidney-shaped indusium.
== Ecology ==
''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 ''Prunus serotina'' are especially vulnerable, as the fern releases an allelopathic phenol which can kill them.
This fern is a wetland indicator, and an endangered species in Illinois.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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