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Rock firmoss

Rock Firmoss
Scientific classification
Domain:Eukaryotes
Kingdom: Plantae
Division: Lycophyta
Class: Lycopsida
Order: Lycopodiales
Family: Huperziaceae
Genus: Huperzia
Speciesporophila
Binomial name
Huperzia porophila (Lloyd & Underw.) Holub

The rock firmoss grows throughout the Appalachian province of the eastern United States, but is rare east of the Appalachians, being most common in a north-south belt along the western plateau area. This firmoss grows only on or over rock, and requires cool, moist, shaded, acid spots. It is a beautiful sight growing over boulders and outcrops. It is often confused with the shining firmoss, Huperzia lucidula, which range it largely shares, but uniformly has eight-ranked leaves, while lucidula largely has six-ranked leaves and grows in seeps, generally not on rocks.