toothed club-moss
Huperzia serrata (Thunb.) Trevis.

Huperzia serrata, the toothed club-moss, is a firmoss native to eastern Asia and parts of the Americas and the Pacific. It is found in regions such as Cuba, Haiti, Hawaii, Japan, Korea, and others. The species is considered vulnerable in Hawaii according to NatureServe.
Description
Huperzia serrata (Thunb.) Trevis. is a member of the Lycopodiaceae family. It is distributed across several regions, including Cuba, Haiti, Hawaii, Japan, Khabarovsk, Korea, Kuril Is., Manchuria, parts of Mexico, Nansei-shoto, Primorye, and Sakhalin. The species was first described in 1874. Commonly known as toothed club-moss, it is absent from the island of Maui in Hawaii. This plant is classified as vulnerable in Hawaiian ecosystems.
Other common names
toothed club-mosstoothed clubmoss
Distribution
Cuba · Haiti · Hawaii · Japan · Khabarovsk · Korea · Kuril Is. · Manchuria · Mexico Northeast · Mexico Southwest · Nansei-shoto · Primorye · Sakhalin · Archipiélago de Cuba
Synonyms
Lycopodium serratum f. intermediumLycopodium serratumHuperzia selago var. serrataUrostachys serratusHuperzia serrata f. intermediaLycopodium serratum var. thunbergiiUrostachys sachalinensisUrostachys serratusHuperzia serrata var. intermediaHuperzia serrata var. paucidentataUrostachys serratus var. sachalinensisPlananthus serratusHuperzia serrata