Urostachys serratus (Thunb.) Herter = Huperzia serrata (Thunb.) Trevis.
English:
serratus,-a,-um;

https://archive.org/stream/mobot31753002226030#page/13/mode/2up
homotypic synonyms:
Huperzia serrata (Thunb.) Rothm.; Huperzia serrata (Thunb.) Trevis.; Lycopodium serratum Thunb.; Urostachys serratus (Thunb.) Herter ex Nessel;

protologue: Bot. Arch. 3: 13 (1923)

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