| Family | Scientific Name | Common Name | Habitat | Distribution | Image |
|---|---|---|---|---|---|
| Lycopodiaceae | Diphasiastrum ×habereri | Dry forests. | Known from widely scattered localities in our area; not always in close proximity to its parents. | ||
| Lycopodiaceae | Diphasiastrum ×verecundum | Bashful Ground-Cedar | |||
| Lycopodiaceae | Diphasiastrum complanatum | Northern Running-Cedar | Forests, woodlands, edges. | The presence of this species as far south as s. New York and ne. Pennsylvania is complicated. Alleged by Gleason & Cronquist (1991) to reach "south in our range to Pa. and Minn.". Wherry et al. (1979) cited numerous occurrences in Pennsylvania which have since been annotated as D. ×habereri; however, Rhoads and Block (2007) later rejected this species from Pennsylvania, apparently due to a lack of specimens. It has been documented in Sullivan County, New York, which sits at the Pennsylvania/New York border; however, Werier et al. (2022) explain that many specimens collected in New York labeled as D. complanatum may actually be D. digitatum. Lastly, some specimens collected in northeastern Pennsylvania appear to potentially be D. complanatum (S. Grund, pers. comm.; 2022); however, these and the aforementioned specimens need critical examination before we can confirm or deny the legitimate (historical or current) presence of this species in Pennsylvania. | |
| Lycopodiaceae | Diphasiastrum digitatum | Southern Running-Cedar, Common Running-Cedar, Fan Ground-Pine, Turkeyfoot, Silver-pine, Turkeybrush | Dry to mesic, usually acid forests and openings, especially common in disturbed sites, such as successional pine forests. | Newfoundland and Labrador (Newfoundland) west to Minnesota, south to South Carolina, Georgia, Alabama, Mississippi, and Arkansas. |  (c) Sorrie, Bruce A. - CC-BY |
| Lycopodiaceae | Diphasiastrum sabinifolium | Juniper Clubmoss, Juniper-leaf Ground-cedar | Forests and meadows. | Newfoundland and Labrador west to Ontario, south to New York, ne. Pennsylvania, and Michigan. | |
| Lycopodiaceae | Diphasiastrum tristachyum | Blue Running-cedar, Ground-cedar | Dry forests, glades, balds, barrens, forest openings. | Newfoundland and Labrador (Labrador) west to Alberta, south to nw. South Carolina, ne. Georgia, Missouri, Minnesota, and e. North Dakota. |  (c) Fleming, Gary P. |