Vascular Plants of North Carolina
Account for New York Fern - Parathelypteris noveboracensis   (L.) ChingOnly member of Parathelypteris in NC.
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Section 2 » Family Thelypteridaceae
Author(L.) Ching
DistributionEssentially throughout the state, but nearly absent from coastal counties and some areas in the southern Coastal Plain. For some unknown reason, the species has been poorly collected from much of the northeastern Piedmont and northern Coastal Plain, despite numerous sight reports.

This is a widespread species in the East, found in most counties in its range, from eastern Canada south to central GA and LA.
AbundanceCommon in the mountains; fairly common to common in the Piedmont and the northern half of the Coastal Plain, but rare to uncommon in the southern Coastal Plain (and there mainly along brownwater rivers). It seems to be increasing in the eastern Piedmont and Coastal Plain in recent decades, as the sightings without collections imply.
HabitatThis is a species of moist, somewhat rich forested areas. It does not require high pH soils, and can be found widely in bottomland forests, on lower hardwood slopes, in bogs, in wooded seepages, and other moist shaded places. However, into the Coastal Plain is it more limited to higher pH soils of rich brownwater bottomlands and lower slopes.
PhenologyFruits from May to August.
IdentificationThis is a familiar fern over most of the state and is easily identified by its odd blade shape. The stipe is generally 5-6 inches long, with a narrowly elliptical blade outline, the blade being about 15 inches long and 5 inches wide on average. The blade is pinnate-pinnatifid, such that the numerous pinnules on a pinna are oblong with a rounded tip, and not quite separated from the next one by a sinus cut to the midrib. The 20-35 pairs of pinnae are mostly opposite, with the longer ones in the middle, about 2-2.5 inches long, but those toward both the apex and the base are shorter, such that the blade has an even taper at both ends, like no other fern species. (Many taper to the apex, but none taper gradually to the base of the blade like in this species.) There are about 10 rounded sori beneath each pinnule.
Taxonomic CommentsOlder references mainly named the species as Thelypteris noveboracensis, in the same genus with Marsh Fern (T. palustris), but some had it in the genus Dryopteris.

Other Common Name(s)None
State RankS5
Global RankG5
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