Uotila, Pertti (2021). «Kaksi alalajia vai viisi lajia?»(PDF). Lutukka. «The genus Huperzia (Lycopodiaceae) in Finland – 2 subspecies or 5 species? The genus Huperzia has been reviewed in Finland following the recent taxonomic study of the genus by Björk (2020) and his revision of a great number of Finnish herbarium specimens in the Botanical Museum of Helsinki (H). Five species (H. acicularis, H. arctica, H. europaea, H. selago and H. suberecta) are recognized for Finland, described, discussed and provided with a key.»