| 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 | The presence of this species as far south as s. NY and ne. PA 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 PA which have since been annotated as D. ×habereri; however, Rhoads and Block (2007) later rejected this species from PA, apparently due to a lack of specimens. It has been documented in Sullivan County, NY, which sits at the PA/NY border; however, Werier et al. (2022) explain that many specimens collected in NY labeled as D. complanatum may actually be D. digitatum. Lastly, some specimens collected in northeastern PA 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 PA. | ||
| Lycopodiaceae | Diphasiastrum digitatum | Southern Running-Cedar, Common Running-Cedar, Fan Ground-Pine, Turkeyfoot, Silver-pine | Dry to mesic, usually acid forests and openings, especially common in disturbed sites, such as successional pine forests. | NL (Newfoundland) west to MN, south to SC, GA, AL, MS, and AR. |  |
| Lycopodiaceae | Diphasiastrum sabinifolium | Juniper Clubmoss, Juniper-leaf Ground-cedar | Forests and meadows. | NL west to ON, south to NY, ne. PA, and MI. | |
| Lycopodiaceae | Diphasiastrum tristachyum | Blue Running-cedar, Ground-cedar | Dry forests, glades, balds, barrens, forest openings. | NL (Labrador) west to AB, south to nw. SC, ne. GA, MO, MN, and e. ND. |  |
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