New York Natural Heritage Program
Smooth Cliff Brake
Pellaea glabella ssp. glabella
Pellaea glabella Troy Weldy
Family: Maidenhair-fern Family (Pteridaceae)

State Protection: Threatened
listed species are those with: 1) 6 to fewer than 20 extant sites, or 2) 1,000 to fewer than 3,000 individuals, or 3) restricted to not less than 4 or more than 7 U.S.G.S. 7 minute topographical maps, or 4) listed as threatened by U.S. Department of Interior.

Federal Protection: Not Listed

State Rarity Rank: S2
A State Rarity Rank of S2 means: This plant is threatened/imperiled in New York because of rarity (typically 6-20 populations or few remaining individuals) or is vulnerable to extirpation from New York due to biological factors.

Global Rarity Rank: G5T5
A Global Rarity Rank of G5T5 means: Secure globally - Both the species as a whole and the subspecies/variety are common in the world; widespread and abundant (but may be rare in some parts of its range).

Did you know?
Scattered throughout upstate New York in fewer than a dozen places, it is a mystery why this fern is so much more rare than it's closely related species Pellaea atropurpurea.

State Ranking Justification [-]
There are 12 known populations and at least four additional historical locations. There are few threats to these populations and a brief trends assessement concluded that this species has been relatively stable in New York for many years. With continued survey work and the discovery of new populations, this plant may one-day move off the active plant list.

Short-term Trends [-]

Long-term Trends [-]