Phlegmariurus squarrosus is a species of lycophyte in the family Lycopodiaceae.

[2] The genus Phlegmariurus is accepted in the Pteridophyte Phylogeny Group classification of 2016 (PPG I),[3] but not in other classifications, which submerge the genus in Huperzia,[4] with this species as Huperzia squarrosa.

[1] The species has a wide distribution from the west Indian Ocean, through tropical and subtropical Asia to eastern Australia and the Pacific.

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