| Family | Scientific Name | Common Name | Habitat | Distribution | Image |
|---|---|---|---|---|---|
| Huperziaceae | Huperzia | Firmoss, Clubmoss |  (c) Fleming, Gary P. | ||
| Huperziaceae | Huperzia ×bartleyi | Bartley's Firmoss | Rock outcrops. | Apparently widely distributed from New York west to w. Wisconsin, ne. Iowa, south to w. North Carolina, nw. South Carolina, nw. Alabama, and e. Missouri, in a scattered pattern associated with the overlap in distribution between its two parents, but not everywhere associated with both parents. | |
| Huperziaceae | Huperzia ×buttersii | Butters's Firmoss | Shale banks. | Known from Scioto County, Ohio, in large numbers, growing with smaller numbers of H. selago. Expected to occur in the overlap regions of its parents. | |
| Huperziaceae | Huperzia ×protoporophila | Rock outcrops and cliff bases. | Known from Chimney Rock Park, Rutherford County, North Carolina (the lowest elevation occurrence of H. appressa in North Carolina), from Roan Mountain, Mitchell County, North Carolina, and Grandfather Mountain, Avery County, North Carolina. | ||
| Huperziaceae | Huperzia appalachiana | Appalachian Firmoss | Rock outcrops at high elevations (very rarely at middle elevations), rarely also in seepage or along banks of small streams at high elevations, and in fens (on hummocks). | Québec and Newfoundland and Labrador (Newfoundland) west to Ontario, Michigan, and Minnesota and south along the Appalachians to w. North Carolina, e. Tennessee, and ne. Georgia. Previous reports of Huperzia selago from the Central and Southern Appalachians re based on this species. | (c) Fleming, Gary P. |
| Huperziaceae | Huperzia lucidula | Shining Firmoss, Shining Clubmoss | Moist forests and ravines. | Newfoundland and Labrador (Newfoundland) to Manitoba, south to nw. South Carolina, n. Georgia, n. Alabama, s. Illinois, and nw. Arkansas (Peck 2011); disjunct in New Mexico (Santa Fe County); disjunct in China (Jilin) (FoC). |  (c) Fleming, Gary P. |
| Huperziaceae | Huperzia porophila | Rock Firmoss, Rock Clubmoss | Rock outcrops and cliffs, especially in the spray of waterfalls, at low to medium elevations, usually on sandstone or felsic metamorphic or metaigneous rocks (acidic schists, gneisses, granitic gneisses), and most characteristically on ledges or in crevices in overhung settings along the cliff face where the plants receive little or no direct sunlight. | Centered in the sedimentary Central Appalachians, H. porophila ranges from ne. Pennsylvania, West Virginia, Ohio, Wisconsin, Ontario, and Minnesota south to w. North Carolina, nw. South Carolina, ne. Georgia, nw. Alabama, and e. Missouri. |  (c) Cressler, Alan M. |
| Huperziaceae | Huperzia selago | Northern Firmoss | Shale banks. | This species is circumboreal, ranging south in North America to New York, New England, and the Great Lakes region, and disjunct to s. Ohio. | |
| Huperziaceae | Huperziaceae | Firmoss Family |  (c) Bradley, Keith | ||
| Huperziaceae | Phlegmariurus | Hanging Firmoss |  (c) Cressler, Alan M. | ||
| Huperziaceae | Phlegmariurus dichotomus | Hanging Firmoss | Cypress swamps, epiphytic on Pond Apple (Annona glabra) and Florida Water Ash (Fraxinus cubensis). | S. Florida (Big Cypress Swamp); West Indies; Mexico (Chiapas, Oaxaca, Puebla, San Luis Potosí, Tamaulipas, Veracruz) south through Central America to n. South America. |  (c) Bradley, Keith |